Leadership & Board

Other Leaders

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  Gary Palmer, MD, MBA, JD

  Chief Medical Officer, Oncology


Gary Palmer, MD, MBA, JD

Chief Medical Officer, Oncology

Dr. Palmer joined BillionToOne in January 2023 as Chief Medical Officer, Oncology. He has held senior leadership positions at multiple successful biotechnology companies. He was Vice President of Medical Affairs at Genomic Health. He served as Chief Medical Officer of On-Q-ity, a circulating tumor cell company. Subsequently, he was Senior Vice President, Medical Affairs at Foundation Medicine, Chief Medical Officer at NantHealth, and most recently Chief Medical Officer at Tempus. Prior to these and several other roles in industry, Dr. Palmer served as a medical oncologist in both academia and in the community setting, including serving as the director of the Medical Breast Service at the University of California, Davis, Cancer Center and Chief of Medical Oncology at the Mercy Health System, Sacramento, California.

Dr. Palmer is a magna cum laude graduate of Yale University and a graduate of the Stanford University School of Medicine. He did his internal medicine training at the Boston City Hospital and his oncology fellowship at the Massachusetts General Hospital. He has a Masters in Business Administration (MBA) from the University of California, Davis, and a Masters in Public Health (MPH) from U.C.L.A. As well, Dr. Palmer holds a J.D. degree and is admitted as an attorney to the State Bar of California.

• 

  Haywood Brown, MD

  Chief Medical Officer, Prenatal


Haywood Brown, MD

Chief Medical Officer, Prenatal

A distinguished obstetrician and gynecologist with over three decades of experience in academic leadership, clinical care, and research, Dr. Brown has dedicated his career to maternal and fetal health, with an emphasis on addressing health disparities. Dr. Brown served in numerous local and national leadership positions, including as the past President of American College of Obstetricians and Gynecologists (ACOG), Society for Maternal Fetal Medicine (SMFM), the American Gynecological and Obstetrical Society (AGOS), and as the former Obstetrics and Gynecology Section Chair for the National Medical Association. Most recently, he was USF Health’s Senior Associate Vice President of Academic and Faculty Affairs and Vice Dean of Faculty Affairs. Previously, Dr. Brown served as the Chair of Obstetrics and Gynecology at Duke University Medical Center, where he held both the Roy T. Parker and F. Bayard Carter Endowed Professorships.

From 2017-2018, Dr. Brown served as the 68th President of the American College of Obstetricians and Gynecologists (ACOG), where he focused on women’s health equity and postpartum care. During his tenure as President, he advocated for maternal mortality prevention and affordable contraception as an essential health benefit under the Affordable Care Act, and for the establishment of nationwide State Maternal Mortality Reviews.

Dr. Brown earned his undergraduate degree from North Carolina Agricultural and Technical State University and his Medical Degree from Wake Forest University School of Medicine. He completed his residency in Obstetrics and Gynecology at the University of Tennessee Center for Health Sciences, Knoxville, and his fellowship in Maternal-Fetal Medicine at Emory University School of Medicine/Grady Memorial Hospital.

• 

  Ross Taylor, MBA

  Chief Financial Officer


Ross Taylor, MBA

Chief Financial Officer

Ross Taylor joined BillionToOne as Chief Financial Officer in January 2024. Ross has 30 years of financial leadership experience spanning roles as chief financial officer for two public companies and as an equity research analyst on Wall Street. Ross was Chief Financial Officer for Codexis, Inc. from 2019 to 2023. In addition, he was Chief Financial Officer of Abaxis, Inc. from August 2015 to July 2018 when Zoetis acquired Abaxis, and Vice President of Business Development & Investor Relations of Abaxis from October 2014 through July 2015. Prior to Abaxis, Ross worked in equity research at various Wall Street firms including CL King & Associates, UBS, Smith Barney, and CJ Lawrence. Mr. Taylor earned a Master of Business Administration degree from Columbia Business School and a Bachelor’s degree in Economics from Duke University.

• 

  Shan Riku, MBA

  Chief Product Officer


Shan Riku, MBA

Chief Product Officer

Shan joined BillionToOne in January 2019. She oversees clinical and software product management, marketing, clinical, and medical affairs at BillionToOne. Shan is passionate about developing and delivering life-changing diagnostic products to patients and providers. 

She has over 15 years of experience in launching and managing a wide range of products from software products to precision diagnostics clinical assays. Shan started her career at McKinsey & Co., where she worked with Fortune 100 companies on various product, branding, and go-to-market strategy projects. Shan holds an MBA from Stanford University, an MPA/ID from Harvard University, and graduated Phi Beta Kappa with a Bachelor of Science in Chemistry from Massachusetts Institute of Technology.




• 

  Tom Lynch, JD

  General Counsel


Tom Lynch, JD

General Counsel

Tom Lynch joined BillionToOne as our first General Counsel in October 2022. He brings over 20 years of experience leading life science teams to bring impactful solutions for patients.  Prior to joining us, he served as Chief Compliance Officer, Advanced Healthcare Solutions at Fortive Corporation.  From 2018 to 2021, Tom served as the Chief Legal Officer at Nuwellis, a publicly traded, medical device company.  Tom served as the Chief Administrative Officer and General Counsel at Orexigen Therapeutics, a publicly traded, biotech company, from 2015 to 2018. Between 2002 and 2015, he held various senior legal and compliance positions at Boston Scientific Corporation and Novartis Pharma, including three years heading the global Neuroscience legal team in Switzerland.

Tom began his legal career representing public and private companies at Dorsey & Whitney LLP.  He holds a bachelor’s degree from Stanford University, a juris doctorate degree from Boston College Law School and a master’s degree in teaching from University of St. Thomas.

• 

  John ten Bosch, PhD, FACMG

  Senior VP of Laboratory Operations


John ten Bosch, PhD, FACMG

Senior VP of Laboratory Operations

John joined BillionToOne in September 2020. He has a passion for genomics, laboratory medicine, and providing quality care to the patients he serves. John has over 10 years of experience providing leadership to high complexity CLIA laboratories including regulatory oversight, clinical laboratory operations, and test development. He joins BillionToOne from Kaiser Permanente where he served both as Laboratory Director and Director of Quality in the Molecular Pathology and Cytogenetics laboratories.

John received his PhD in Molecular and Cell Biology from UC Berkeley and served as a Postdoctoral Fellow in Laboratory Genetics and Genomics at Stanford and UCLA.

• 

  Nancy Johnson, MT (ASCP)

  Senior VP of Sales and Commercial Operations


Nancy Johnson, MT (ASCP)

Senior VP of Sales and Commercial Operations

Nancy joined BillionToOne in 2019. Nancy has a passion for building and leading commercial sales teams. She believes in the empowerment of individuals to achieve personal and professional goals. Nancy brings more than 20 years of diagnostic sales leadership experience in both start-up and large-scale sales organizations. Most recently Nancy played an instrumental role in Foundation Medicine’s commercial strategy and execution, building and leading her sales team to success. Prior to Foundation Medicine, she held several commercial leadership positions at various molecular diagnostic companies.

Nancy started her career as a board-certified Medical Technologist and holds a BS in Medical Technology from Creighton University.

• 

  Brent Kirk

  VP of Sales Strategy & Operations


Brent Kirk

VP of Sales Strategy & Operations

Brent joined BillionToOne in July 2019. He believes that one size does not fit all with hospitals, physicians, and patients. Brent drives our sales strategy and operations teams to ensure customer loyalty while improving the satisfaction of both internal and external partners. An unrelenting executionist, Brent has fiercely loyal customers and has helped multiple start-ups with hyper-growth plans from series A through IPO.

Brent graduated from the University of Arizona and has a history of success in the tech and biotech industries.

• 

  Bryce Moller, MBA

  VP of Quality Assurance & Regulatory Affairs


Bryce Moller, MBA

VP of Quality Assurance & Regulatory Affairs

Bryce joined BillionToOne in June 2023 as the Vice President of Quality Assurance and Regulatory Affairs. Bryce has worked in the medical device and molecular diagnostic space for over 26 years. Most recently, Bryce was the Vice President of Quality at Lucira Health where he was responsible for leading to market the first ever FDA approved direct-to-consumer multiplex Covid/Flu diagnostic test.

Prior to joining Lucira Health, Bryce has held various leadership roles in Quality, Regulatory, Operations, and Continuous Improvement at companies such as Becton Dickinson, DJO Global, Zimmer, and Cardinal Health.

Bryce is a lean champion and change ambassador who believes in a proactive quality approach that reduces costs, improves productivity, increases overall quality, and improves customer loyalty.

Bryce holds a Bachelor of Science degree in Industrial Engineering, a Master of Science degree in Manufacturing Management, a Master of Science degree in Operations Management, an MBA in Leadership, and is a Certified Six Sigma Master Black Belt and Kepner Tregoe (KT) Trainer.

Bryce will play a critical role in Continuous Improvement, Regulatory Strategy, and Quality implementation at BillionToOne.

• 

  Carrie McGehee

  VP of Market Access


Carrie McGehee

VP of Market Access

Carrie McGehee joined the BillionToOne team in August 2021. Carrie is passionate about expanding access to novel diagnostic tests and is recognized for her ability to gain coverage and contracts with Medicare, Medicaid, and private insurance companies. Her work has been defined by developing and implementing strategic and innovative ways to overcome challenges that accelerate top and bottom-line growth. Carrie brings over 20 years of experience working with molecular diagnostic companies and has held several leadership positions including 11 years at Genzyme Genetics and 6 years at Sequenom Center for Molecular Medicine, the first company to bring non-invasive prenatal testing (NIPT) to the market. Carrie and her team were instrumental in policy development for NIPT and contracted with over 200 payers in the US.


Carrie started her career in healthcare as a neonatal intensive care and pediatric Registered Nurse. She graduated from North Texas Central College with a degree in Nursing.

• 

  Cory Jones

  VP of Marketing


Cory Jones

VP of Marketing

Cory joined BillionToOne in December 2023. Cory oversees brand and growth marketing for BillionToOne corporate and product brands Unity and NorthStar. He brings more than 20 years of experience in marketing across many sectors including Tech, Hospitality, Telecom, Travel, and Retail. Most recently Cory was CMO at a fast growing Telepsychiatry brand where he found a passion for healthcare. 

Cory started his career in management consulting with Accenture and holds a BBA in Strategic Management from University of North Texas.

• 

  Jennifer Hoskovec, MS, CGC

  VP of Medical Affairs, Prenatal


Jennifer Hoskovec, MS, CGC

VP of Medical Affairs, Prenatal

Jennifer joined BillionToOne in July 2020. As a certified genetic counselor with over 17 years of clinical experience, Jen is committed to ensuring patients and providers are supported and educated about the options and utility of prenatal testing. Jen joins BillionToOne after 17 years as a prenatal genetic counselor at UTHealth where she led a team of genetic counselors providing patient care in MFM clinics across the city of Houston. Jen has extensive volunteer and leadership experience within national societies such as American College of Obstetrics and Gynecology and National Society of Genetic Counselors. She served as president of NSGC in 2014.

Jen earned her MS in genetic counseling from the University of Texas Health Science Center in Houston and her Bachelor of Science in Biology with a minor in Chemistry from Truman State University.

• 

  Judy Wong

  VP, Controller


Judy Wong

VP, Controller

Judy Wong joined BillionToOne as Vice President, Controller in July 2024. She has over 20 years of experience in accounting and finance operations, with a focus in the life science industry. Prior to joining BillionToOne, Judy held various corporate and management positions at public and privately held companies, including Vivani Medical, Inc., HeartFlow, ALX Oncology and Abaxis (acquired by Zoetis).Earlier in her career, she worked in public accounting, where she also served as auditor in the audit and assurance practice at Deloitte. Judy received her BA from the University of California, Berkeley and MBA from San Jose State University. She is a certified public accountant in the state of California.

• 

  Lisa Edelmann, PhD

  VP of Lab Operations


Lisa Edelmann, PhD

VP of Lab Operations

Lisa joined BillionToOne in September of 2023. Recognized nationally as an expert in population-based carrier screening and has published extensively on Ashkenazi Jewish genetic disorders, Lisa has developed several novel test methods, including the identification of individuals that are at increased risk of being silent carriers for spinal muscular atrophy as well as the use of genetic ancestry in pan-ethnic carrier screening. With more than 18 years of experience as a clinical laboratory leader and CLIA director, Lisa was a co-founder of Sema4 and held the title of Chief Diagnostics Officer from 2017 to 2022. Prior to her time at Sema4, Lisa was the Executive Director of the Mount Sinai Genetic Testing Laboratory.

Lisa received her Ph.D. in Molecular Genetics from The Albert Einstein College of Medicine and received her fellowship training from the Icahn School of Medicine at Mount Sinai where she became board certified in Clinical Molecular Genetics and Clinical Cytogenetics. Lisa currently holds the academic title of Associate Professor in the Department of Genetics and Genomic Sciences at Mount Sinai.

• 

  Laurentius von Liechti, MSc

  Senior Director of Software Engineering


Laurentius von Liechti, MSc

Senior Director of Software Engineering

Laurentius von Liechti is a veteran technology leader and engineering executive with over two decades of experience driving innovation across healthcare, AI, and digital platforms. As Senior Director of Software Engineering at BillionToOne, Laurentius leads software development initiatives that support the company’s mission to make molecular diagnostics more accurate and accessible.

Laurentius brings a track record of high-impact leadership at fast-scaling startups and public companies alike. Prior to joining BillionToOne, he served as Chief Technology Officer at Kaia Health, where he oversaw R&D, security, compliance, and operations, and played a pivotal role in tripling annual recurring revenue and advancing the company’s AI-driven digital therapeutics. He has also held CTO and similar roles at Autolist (acquired by CarGurus), Dictionary.com, and TrueCar, where he helped lead the company through a successful IPO.

Laurentius holds a Master’s in Applied Artificial Intelligence from the University of San Diego and a BSc in Computer Science from California Lutheran University. He has also completed executive and professional programs in business (Stanford GSB), product (SVPG), human-computer interface design (Carnegie Mellon), and database systems (CMU Software Engineering Institute), and is a Stanford GSB alum.

• 

  Gemma English

  VP, Reimbursement


Gemma English

VP, Reimbursement

Gemma English joined the BillionToOne team in April 2023. Gemma is passionate about building winning teams and resolving payer issues, transforming companies through reimbursement success. She believes in leading with collaboration and innovation to navigate the ever-changing realm of reimbursement.  Gemma brings over 2 decades of experience in reimbursement, including start-ups and public companies. Gemma has been in leadership roles at Sequenom Laboratories, Invitae, Pathnostics and Bridge Diagnostics. Gemma has a Bachelor of Business Administration in Accounting.

• 

  Dhruv Swaroop, MBA

  Senior Director of Product


Dhruv Swaroop, MBA

Senior Director of Product

Dhruv joined BillionToOne in July 2021, after several years spent working in finance, technology and healthcare in the United States, Singapore, and India. He is excited to bring those diverse experiences and perspectives to something he is passionate about—using innovation to improve individuals’ health and quality of life. Dhruv focuses on providing the best technology solutions to patients and providers, including EMR integrations, portals and other software tools that improve turnaround time and efficiency.

Dhruv received his MBA from the MIT Sloan School of Management, where he was awarded the Legatum Center for Development and Entrepreneurship Fellowship, and graduated with a Bachelor of Science in Mechanical Engineering from Carnegie Mellon University.

• 

  Michele Phelps

  Senior Director of Financial Planning & Analysis


Michele Phelps

Senior Director of Financial Planning & Analysis

Michele Phelps joined BillionToOne in September 2021. She is passionate about building efficiencies and scaling processes to allow companies to improve patient care and develop life changing products. She has 18+ years of finance experience in both start-up and multi-national companies in the life sciences and technology industries, with 13+ years focused in the oncology laboratory diagnostic space.

Prior to joining BillionToOne, Michele was at Exact Sciences, where she led FP&A for the Precision Oncology Business Unit and post-merger acquisitions. Before Exact Sciences, as Director of FP&A at Genomic Health, Michele scaled the FP&A team to support four core product launches and international entity and product expansion.

Michele began her career as part of the StubHub start-up team and played a key role in the later acquisition by eBay. Michele has a Bachelor of Science in Corporate Finance and Financial Services.

• 

  Steven Drucker, MBA

  Senior Director of Market Access


Steven Drucker, MBA

Senior Director of Market Access

Steven Drucker joined the BillionToOne team in May 2022.  Steven is passionate about market access strategy and working to drive growth through data-centric initiatives.  He has over 23 years of experience in the pharmaceutical and diagnostics industries, with a proven track record of successful patient access and payer coverage strategies.

Steven most recently served as the Director, Payer Relations and Reimbursement at Foundation Medicine, and has held various customer-facing positions at Castle Biosciences, Genomic Health and Sanofi.  Steven is responsible for payer medical policies, contract implementation and revenue pull through.  

Steven has a Bachelor of Business and a Master of Business Administration.

• 

  Vaghar Haghiri

  Senior Director of People Operations


Vaghar Haghiri

Senior Director of People Operations

Vaghar joined BillionToOne in December of 2021 as the first member of the People Operations team. Vaghar oversees all aspects of People Operations, including Talent Acquisition and the full employee experience. Vaghar is passionate about helping companies scale, while maintaining an industry leading employee experience and maximizing employee retention.

Vaghar is a seasoned HR Operational Leader with over 15 years of experience in driving organizational growth and efficiency. With a strong background in organizational development, system implementation, and strategic analysis, Vaghar has a proven track record of enhancing company growth, while establishing and/or maintaining thriving company cultures. His expertise spans across business forecasting, capital strategies, team building, and HR compliance.

Throughout his career, Vaghar has held leadership positions at innovative healthcare organizations such as Gateway Learning Group, and CID Management. He has consistently demonstrated his ability to build high-performing teams, drive key initiatives, and facilitate growth. Vaghar’s notable achievements include redesigning employee experience cycles, resulting in significant increases in retention and revenue, implementing multiple ATS and HRIS systems, and developing complex automated payroll systems that drastically reduced overhead costs.

With a Bachelor of Science in Computer Engineering & Minor in Mathematics from San Jose State University, Vaghar combines his technical acumen with strong operational leadership to deliver impactful results in the HR and operations space.

• 

  Heather Shappell

  Senior Director of Market Access, Policy Development


Heather Shappell

Senior Director of Market Access, Policy Development

Heather joined BillionToOne in July 2023 as the Director of Market Access, Policy Development. As a certified genetic counselor with over 20 years of combined business and clinical experience, Heather is focused on ensuring that patients and providers are empowered to access genomic technologies and targeted therapies that provide them with the information and options most critical to timely healthcare decision-making. Heather joins BillionToOne with over 18 years of experience in clinical policy development, utilization management and molecular coding, billing and reimbursement.

Heather has extensive volunteer and leadership experience within national societies and government agencies such as the National Society of Genetic Counselors and the Centers for Medicare & Medicaid Services where she has served on the Medicare Advisory Panel on Clinical Diagnostic Laboratory Services since 2019. She also served on the Board of Directors of NSGC in 2019-2020.


Heather earned her MS in genetic counseling from the University of Pittsburgh and her Bachelor of Arts in Anthropology from Temple University.

• 

  Amy Sharma, MBA

  Director of Product, Prenatal


Amy Sharma, MBA

Director of Product, Prenatal

Amy joined BillionToOne in June 2022 and has 10+ years of experience in marketing, product strategy, and product management across the pharmaceutical, medical device, and molecular diagnostic verticals.  Amy is passionate about delivering novel technologies which have the potential to change the clinical paradigm for women’s health. Since 2016, she has focused her career in doing so at companies including Counsyl, Myriad Women’s Health, and DotLab.

Amy started her career as a process engineer and holds a Bachelors of Science from UCLA with a major in Chemical and Biomedical Engineering. She also holds an MBA from Duke University where she focused in Health Sector Management and Marketing.

• 

  Brandon Resendez

  Area Director – West


Brandon Resendez

Area Director – West

Brandon joined BillionToOne in 2021 as the Regional Sales Manager in Texas and was responsible for building out the Texas team. In January of 2023, Brandon was promoted to Area Sales Director of the Western region.

Brandon has worked in medical sales for over 23 years with more than 10 years in the molecular diagnostic lab space focused on women’s health. Brandon has held positions from Sales Representative to Regional Sales Director and has won multiple Chairman’s Club awards during his career.

Brandon believes in building strong diagnostic sales teams through ongoing coaching, creating a collaborative environment, and developing sales professionals with a passion for changing how healthcare is delivered.

Brandon holds a Bachelor of Science degree in Biology from Lamar University.

• 

  Brittany Williams

  Area Director – East


Brittany Williams

Area Director – East

Brittany joined BillionToOne in April of 2021. During her tenure with BillionToOne, she has held positions as Area Sales Manager, Director of Learning & Development, and is currently BillionToOne’s Area Sales Director of the East Region, overseeing 26 states. 

Brittany brings 15 years of medical sales experience to BTO, nine years of which have been in the diagnostic lab space. She is a multi-time President’s Club winner and has held the accolades of Rookie of the Year, Account Executive of the Year, Area Manager of the Year, and #1 in the salesforce (Account Executive and Area Sales Manager) throughout her career. 

Brittany focuses her efforts on coaching through change, solutions-oriented approaches, unwavering accountability, and the full investment in and the development of people which leads to successful business owners. Brittany is passionate about driving results year after year by creating fervent sales teams who partner with providers to ensure the best possible care for patients and who are experts in their field. 

Brittany holds a B.S. from Samford University in Business Management with a Marketing Concentration.

• 

  Elliott Margulies, PhD

  Director of Bioinformatics


Elliott Margulies, PhD

Director of Bioinformatics

Elliott joined BillionToOne in August 2024. His career spans both academia (NIH) and industry (Illumina), focusing on developing software and informatics systems that make genomic information accessible and actionable for physicians and patients. As a strategic bioinformatics leader, Elliott is dedicated to building interdisciplinary teams that bridge software development and genome analysis, driving impactful clinical applications. His leadership has shaped scalable bioinformatics solutions that accelerate the adoption of genomics in healthcare.

Elliott earned his PhD in Human Genetics from the University of Michigan and completed a postdoctoral fellowship at the National Human Genome Research Institute.

• 

  Jay Chang, MD

  Director of Medical Partnerships


Jay Chang, MD

Director of Medical Partnerships

Dr. Jay Chang joined BillionToOne in 2021 with over a decade of experience as an OBGYN in private practice. His diverse background is perfectly suited for his role as the Director of Medical Partnerships. He graduated from the University of Texas in Austin on The Dean’s List with the highest honors, double majoring in Neurobiology, B.S. and a Human Biology: Genetics and Biotechnology, B.S. all before turning 20 years old. He completed medical school at the University of Texas Southwestern in Dallas before starting residency at Albert Einstein College of Medicine in the Bronx. From there he could not turn down an opportunity to transfer and complete his residency at Cedars-Sinai in Los Angeles. His unique training spans both the East and West Coast and even Parkland Memorial Hospital at the foundation of obstetrics at the heart of the country gives him first hand knowledge of the challenges faced by physicians in different parts of the country. He has a unique love of both the science and the medicine while excelling in both. He passion for caring for pregnant patients and their unborn babies is unparalleled and contagious. His dedication to teaching has won him numerous awards from his patients, attendings, colleagues, nurses, and trainees, including: The Patient Safety Award, Outstanding Chief Resident Award, Golden Apple Teaching Award, Circle of Friends at Cedars-Sinai, Perfect Scores on Patient Satisfaction by Press Ganey, etc. At BillionToOne Dr. Chang is scaling his impact on patients from thousands to millions each year. 

• 

  Jonathan Stumpf

  Director of Market Access


Jonathan Stumpf

Director of Market Access

Jon joined BillionToOne in August of 2022 as a Director of Market Access. Jon is dedicated to building lasting business relationships with BillionToOne’s Managed Care partners. Jon is focused on ensuring their member/patients have access to the valuable testing results BillionToOne can provide them in their critical time of care.

Jon brings tremendous experience to the Market Access Team in Women’s Health, Oncology, and Precision Medicine. He has been in the genetics, and diagnostic arena for over 25 years in his previous roles at Genzyme Genetics, Integrated Genetics, and Invitae. Jon is responsible for building new payer business relationships, medical policies, contract implementation, and revenue pull-through.

• 

  Julia Wynn

  Director of Clinical Research


Julia Wynn

Director of Clinical Research

Julia joined BillionToOne in 2022 and has more than 15 years of experience as a clinical and research genetic counselor. Prior to joining BTO, Julia was an Associate Professor of Genetic Counseling at Columbia University Medical Center. She led and participated in research exploring the patient experience of genetic testing and the clinical implementation of novel genetic technology. Julia is author or co-author on over 90 peer reviewed journal articles. Among her multiple volunteer experiences, she was chair of the Research Quality and Outcomes committee and co-chair of the Research Special Interest Group of the National Society of Genetic Counselors (NSGC). She was the recipient of the Jane Engelberg Memorial Fellowship in 2016.

Julia earned her masters in epidemiology from Columbia University and her masters in genetic counseling from the University of Texas Health Science Center in Houston.

• 

  Kristie Smith, MS, CGC

  Director of Sales Training


Kristie Smith, MS, CGC

Director of Sales Training

Kristie joined BillionToOne in June 2023 with over twenty years of clinical genetics, diagnostic laboratory, and sales training experience. Prior to joining BillionToOne, Kristie spent her previous six years leading the clinical support, education and training team at Sema4. Kristie believes knowledge has the potential to be powerful and is passionate about bringing novel, high-quality genetic testing solutions to healthcare providers and the patients they serve. Kristie has been an active member of the National Society of Genetic Counselors since 1999.

Kristie earned her Master’s of Science in Human Genetics, specializing in Genetic Counseling from the University of Michigan and her Bachelor of Science in Biology with a minor in Mathematics from William Smith College.

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  Kitty Li

  Director of Lab Operations


Kitty Li

Director of Lab Operations

Kitty joined BillionToOne in April 2020. She has a passion for cutting edge lab diagnostics and providing quality care to the patients she serves. Prior to joining BTO, Kitty has worked in multiple biotech companies throughout San Diego and Bay Area. She was previously at Guardant Health where she built the lab operations for their oncology MRD assay.

Kitty received her clinical laboratory training at University of California, Irvine Medical Center and is a board-certified Medical Technologist. She holds a bachelor’s degree in Molecular and Cell Biology from University of California, Berkeley.

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  Sunny Dunlavey, MBA

  Director of Market Access


Sunny Dunlavey, MBA

Director of Market Access

Sunny joined BillionToOne in September 2022 as a Director of Market access, while bringing over 18 years of experience in the diagnostic industry.

Sunny’s passion is rooted in the patient and believes that the role of a well-developed diagnostic test is life changing to the patients in which it serves. As science and technology continues to push the limits of conventional medicine, it is imperative that patients and clinicians have access to these valuable tools.

Prior to BillionToOne, Sunny worked for large commercial labs such as Quest Diagnostics and LabCorp. More recently, Sunny worked with specialty esoteric companies such as Myriad Genetics and Foundation Medicine where she initiated medical policy updates and executed numerous contracts resulting in key revenue growth.

Sunny completed her Bachelor of Science in Public Relations with a Business minor at the University of Florida where she developed her love for the SEC and Gators. Sunny then went on to complete her MBA at Florida State University where she learned to overcome her moral dilemma of attending a rival school.

• 

  Taylor Pollock, JD

  Associate General Counsel


Taylor Pollock, JD

Associate General Counsel

Taylor Pollock joined the BillionToOne Legal and Compliance team in August 2023. Taylor has more than 20 years of private practice and in-house experience in the healthcare and life sciences fields, including more than a decade of leadership and management experience in the medical device industry. He has built and developed high-performing, proactive legal teams and is experienced in handling a broad range of legal and business issues, including complex litigation, M&A and commercial matters. Prior to going in-house, Taylor was in private practice at two Denver law firms providing legal and compliance advice to hospitals, physician groups and other healthcare industry clients.

He holds a bachelor’s degree from Florida State University and a law degree from University of Denver.

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  Karel Hurka

  Senior Director of Supply Chain


Karel Hurka

Senior Director of Supply Chain

Karel joined BillionToOne in March of 2022. He brings 20+ years of experience in all facets of supply chain and materials management spanning inventory management, purchasing, ERP systems, cold chain, production planning, warehousing operations, and vendor & CMO management. His past biotech work experiences include Pendulum Therapeutics, CareDx, Adaptive Biotechnologies, Genomic Health, and Applied Biosystems.

Karel Started his career with Monsanto upon graduation from the University of South Carolina with a BS in Business Administration – Finance.

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  Elaine Cull

  Director of Regulatory Affairs, Oncology


Elaine Cull

Director of Regulatory Affairs, Oncology

Elaine joined BillionToOne in November 2024. She began her career as a technical writer supporting nucleic acid-based blood screening tests for blood banks, and immediately found that that intersection of smart people doing interesting science and products that make a significant impact to people’s lives was the only place for her. Her career of over 20 years since that time has followed that path, with roles at Novartis, Zeiss, CooperVision, and, most recently, Invitae, where she obtained the first FDA authorization for a hereditary cancer germline profiling assay. A passion for service also inspired a year in the Peace Corps, teaching English in Uzbekistan.

Elaine graduated magna cum laude from University of California, San Diego, and, after a year of volunteer work with refugees, followed with a graduate certificate in Technical and Professional Writing from San Francisco State University.

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  Ezequiel Renzulli

  Director of Product Partnerships, Oncology


Ezequiel Renzulli

Director of Product Partnerships, Oncology

Ezequiel brings over 15 years of comprehensive experience in the oncology ecosystem, bridging innovative technologies, patient care delivery, clinical trial solutions, and R&D. As a seasoned leader, he has cultivated expertise in business development, commercial, research, and strategic partnerships, with a focus on life science and biopharma collaborations.

Currently serving as the head of biopharma oncology partnerships at BillionTo to One, Ezequiel is focused on expanding the company’s precision oncology initiatives through strategic collaborations. His professional approach centers on transforming cancer drug R&D through cutting-edge technologies and collaborative partnerships.

Originally from Argentina and now based in Miami, Ezequiel brings a global perspective to healthcare innovation, consistently demonstrating a commitment to advancing oncological solutions through technological and strategic insights.

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  Mike Lemieux

  Director of Market Access, Policy Development, Oncology


Mike Lemieux

Director of Market Access, Policy Development, Oncology

Mike Lemieux joined the BillionToOne team in January 2025. Mike is a biologist by training and has worked across several industries over the last decade, including academic, large pharmaceutical, small biotech, and not-for-profit organizations. He most recently led the technology assessment team at a national laboratory benefit management company representing over 40 million covered lives across the U.S. and helped to increase access to rigorously validated laboratory developed tests. Away from work, Mike is a dedicated martial artist, avid gamer, and proud father. He especially enjoys time traveling with his family.

Mike earned a Ph.D. in cell biology from the University of Connecticut, where he authored a dissertation on the mechanisms that drive cytoskeletal rearrangement to promote cellular motility, endocytosis, multicellular development, and cytokinesis.

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  Rob Thompson

  Director of Inside Sales


Rob Thompson

Director of Inside Sales

Rob joined BillionToOne in September 2019 and is passionate about building high-performing teams while ensuring a positive experience for both patients and providers. As the leader of the inside sales team, he drives customer loyalty and revenue growth by optimizing operations and fostering strong customer relationships. Dedicated to delivering top-tier service, Rob collaborates closely with internal teams and external partners to enhance customer satisfaction.

Rob holds a Bachelor of Arts in Business Administration and has held multiple leadership roles in the tech and biotech industries, bringing extensive experience in team development and strategic growth.

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  Scott Williams

  Director of Business Development


Scott Williams

Director of Business Development

Scott Joined BilionToOne in 2021..  He has worked in start up and large-scale organizations and is passionate about driving growth through strategy and cross organizational collaboration. Scott began his career in pharmaceuticals and has worked in the biotech, device, and hospital services sectors. He brings over 20 years of Business Development, Leadership, and Training experience in medical sales with a primary focus in women’s health.  Scott came to BilliionToOne with a strong Business Development acumune from OB Hospitalist Group where he worked as a Director of Business Development.

Scott earned his BS degrees in marketing and economics at Truman State University.