Aerial view of crowd connected by lines

Leadership & Board

  • Oguzhan Atay, PhD

    Co-Founder, CEO, and Board Chair
  • David Tsao, PhD

    Co-Founder, CTO, and Board Member

“We did not ask what other people are doing and can we do it better. We asked what is physically possible given the number of molecules in a sample.”

Oguzhan Atay

Oguzhan Atay

A BillionToOne co-founder, Oguzhan believes that diagnostics can be made much more powerful, accurate, and affordable if they are engineered to be quantitative. Oguzhan helped develop our proprietary molecular counting platform. He has led the Company since its inception and raised more than $200M in funding including from venture capital funds and investors who previously invested in tech companies such as SpaceX, Box, Spotify, Palantir, Braintree, and biotech companies such as Counsyl, WebMD, and Omada Health.

Oguzhan received his PhD from Stanford University, where his work was published on the Cover of Cell Systems. He graduated summa cum laude and Phi Beta Kappa from Princeton University with a bachelor’s in molecular biology and minors in physics, computer science, and applied mathematics.

David Tsao

David Tsao

A BillionToOne co-founder, David believes that applying engineering principles to biology will be transformative for medicine. He is the original inventor of our molecular counting platform and has presented BillionToOne’s clinical trial results at a variety of national conferences. David oversees all technology developments at BillionToOne.

He received a PhD in bioengineering from Rice University, where he was awarded a Nanobiology training fellowship. David has a bachelor’s degree in physics, cum laude, from Princeton University with minors in biophysics and engineering management systems. While at Princeton, he was twice awarded the Shenstone Prize in Physics.

Other Leaders

  • Gary Palmer, MD, MBA, JD

    Chief Medical Officer, Oncology
  • Dr. Gary  Palmer

    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.

  • Ross Taylor, MBA

    Chief Financial Officer
  • Ross Taylor-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

    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

    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

    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

    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

    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-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

    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

    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.

  • Gemma English

    VP of Reimbursement
  • Gemma English, VP of Reimbursement

    Gemma English

    VP of 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.

  • Jennifer Hoskovec, MS, CGC

    VP of Medical Affairs, Prenatal
  • Jennifer Hoskovec

    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.

  • Dhruv Swaroop, MBA

    Senior Director of Product
  • Dhruv  Swaroop

    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.

  • Karel Hurka

    Senior Director of Supply Chain
  • Karel Hurka

    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.

  • Taylor Pollock, JD

    Associate General Counsel
  • Taylor Pollock-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.

  • Lisa Edelmann, PhD

    Senior Laboratory Director
  • Lisa Edelmann          PhD, FACMG

    Lisa Edelmann, PhD

    Senior Laboratory Director

    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.

  • Michele Phelps

    Senior Director of Financial Planning & Analysis
  • Michele Phelps

    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.

  • Vaghar Haghiri

    Senior Director of People Operations
  • Vaghar  Haghiri

    Vaghar Haghiri

    Senior Director of People Operations

    Vaghar Haghiri joined BillionToOne in December of 2022 bringing 10+ years of experience supporting rapid growth of various healthcare startup companies, two of which were acquired after Vaghar joined.

    Vaghar started his career at CID Management as one of the original 10 employees, where he implemented systems and processes, which helped grow the company to over 1000 employees in less than a year, leading to the acquisition from Genex Services. Vaghar has a Bachelors of Science in Computer Engineering from San Jose State University.

  • Steven Drucker, MBA

    Senior Director of Market Access
  • Steven Drucker

    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.

  • Amy Sharma, MBA

    Director of Product, Prenatal
  • Amy Sharma

    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 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 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.

  • Brandon Hensinger, MBA

    Director of International Sales
  • Brandon Hensinger-Director of International Sales

    Brandon Hensinger, MBA

    Director of International Sales

    Brandon Hensinger joined BillionToOne in 2022 as the Director of International Sales, while bringing a unique blend of international experience and linguistic skills. Fluent in English, Spanish, Portuguese, Mandarin, and Arabic, Brandon is adept at bridging cultural divides and building strong business relationships around the globe. His extensive track record in diagnostic sales leadership, both startups and multinational corporations, has seen him cultivate high-performing teams and drive significant growth.
    Aside from his professional pursuits, Brandon is a passionate adventurer, with a particular love for rock climbing and mountaineering. He began his career with a degree in Organizational Communication and later obtained his MBA in International Business, a combination that now enables him to expertly navigate the intersection of science and commerce at BillionToOne.

  • Heather Shappell

    Director of Market Access, Policy Development
  • Heather Shappell-Director of Market Access, Policy Development

    Heather Shappell

    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.

  • Jay Chang, MD

    Director of Medical Partnerships
  • 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

    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

    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.

  • Kitty Li

    Director of Lab Operations
  • 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.

  • Kristie Smith, MS, CGC

    Director of Sales Training
  • Kristie N. 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.

  • Marc Dantone, BS, MBA

    Director of Product Management, Oncology
  • Marc Dantone, BS, MBA-Director of Product Management, Oncology

    Marc Dantone, BS, MBA

    Director of Product Management, Oncology


    Marc joined Billion To One in May of 2023 and oversees oncology product management and marketing. He has been working in oncology diagnostic product management since 2009 and is passionate about developing cutting edge assays that address significant unmet needs for oncologists and ultimately improve outcomes for patients.  

    With a focus on the needs of oncologists and cancer patients, Marc has developed and launched numerous tumor-specific assays designed to improve the diagnosis of cancer as well as well multiple pan-cancer assays targeting minimal residual disease (MRD), comprehensive genomic profiling (CGP), recurrence monitoring and therapy response monitoring indications. Marc has also led or contributed to multiple successful reimbursement submissions within the oncology diagnostics market.  His educational background includes a bachelors of science degree in cellular & molecular biology from the University of Texas at Austin and an MBA from the University of Houston.

  • Sunny Dunlavey, MBA

    Director of Market Access
  • Sunny Dunlavey-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.

Board of Directors

  • Oguzhan Atay

    Co-Founder, CEO, and Board Chair
  • David Tsao

    Co-Founder, CTO, and Board Member
  • Firat Ileri

    Hummingbird
  • Swaroop Kolluri

    Neotribe
  • Tom Bremner

    Adams Street
Oguzhan Atay

Oguzhan Atay

Co-Founder, CEO, and Board Chair

A BillionToOne co-founder, Oguzhan believes that diagnostics can be made much more powerful, accurate, and affordable if they are engineered to be quantitative. Oguzhan helped develop our proprietary molecular counting platform. He has led the Company since its inception and raised more than $200M in funding including from venture capital funds and investors who previously invested in tech companies such as SpaceX, Box, Spotify, Palantir, Braintree, and biotech companies such as Counsyl, WebMD, and Omada Health.

Oguzhan received his PhD from Stanford University, where his work was published on the Cover of Cell Systems. He graduated summa cum laude and Phi Beta Kappa from Princeton University with a bachelor’s in molecular biology and minors in physics, computer science, and applied mathematics.

David Tsao

David Tsao

Co-Founder, CTO, and Board Member

A BillionToOne co-founder, David believes that applying engineering principles to biology will be transformative for medicine. He is the original inventor of our molecular counting platform and has presented BillionToOne’s clinical trial results at a variety of national conferences. David oversees all technology developments at BillionToOne.

He received a PhD in bioengineering from Rice University, where he was awarded a Nanobiology training fellowship. David has a bachelor’s degree in physics, cum laude, from Princeton University with minors in biophysics and engineering management systems. While at Princeton, he was twice awarded the Shenstone Prize in Physics.

Firat Ileri

Firat Ileri

Firat Ileri is a board member at BillionToOne. Learn more about him on the Hummingbird website.

Hummingbird logo
Swaroop Kolluri

Swaroop Kolluri

Swaroop Kolluri is a board member at BillionToOne. Learn more about him on the Neotribe website.

Neotribe logo
Tom Bremner

Tom Bremner

Tom Bremner is a board member at BillionToOne. Learn more about him on the Adams Street website.

Adams Street Logo
collage of four photos of BillionToOne employees playing chess, having a conversation on a couch, playing video games, and discussing work at a standing desk with an open laptop

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Leading Molecular Diagnostics Company BillionToOne Raises $130 Million in Oversubscribed Series D Funding Over $1B+ Valuation

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Oguzhan Atay recognized by Slice of Healthcare as a Top Leader in Digital Health

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General Information

With New Validation Data, BillionToOne Boosts Commercial Prospects of Therapy Selection Assay

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ASCO24: BillionToOne unveils results from tumour profiling test comparison

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GenomeWeb- BillionToOne Pushing Forward in Cancer Diagnostics With First Data on Response Monitoring Test

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BioWorld MedTech Interview- BillionToOne test reduces need for Rhogam in 40% of Rh-negative pregnancies

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BILLIONTOONE MITIGATING RHOGAM(R) SHORTAGE WITH UNITY FETAL RhD™ NON-INVASIVE PRENATAL TEST

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BillionToOne is recognized by Forbes as one of America’s Best Startup Employers for 2024!

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BILLIONTOONE ANNOUNCES ROSS TAYLOR AS CHIEF FINANCIAL OFFICER

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BillionToOne to Present at the 42nd Annual J.P. Morgan Healthcare Conference

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