Remove fear
of the unknown


The status quo that makes healthcare expensive, opaque and out of reach for the majority


We’re a precision diagnostics company that quantifies biology to create powerful molecular diagnostics that are extremely accurate and accessible to all.

Our Leadership

Originating from Y Combinator (S17), our team of engineers, scientists and industry experts are redefining healthcare with tools that quantify biology.

Oguzhan Atay, PhD


Oguzhan believes that diagnostics can be made much more powerful, accurate, and affordable if they were engineered to be quantitative. At BillionToOne, Oguzhan helped develop a patent-pending molecular counter platform that increases the resolution of molecular diagnostics by over a thousandfold. He has led BillionToOne through Y Combinator and raised more than $100M 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, where his work was published on the Cover of Cell Systems.

Previously, Oguzhan 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, PhD


David believes that applying engineering principles to biology will be transformative for medicine. He is the original inventor of the DNA molecular counting platform at BillionToOne and has presented BillionToOne’s clinical trial results at national medical conferences. 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. He received a PhD in bioengineering from Rice University, where he was awarded a Nanobiology training fellowship.

Nipun Soni joined as our Chief Financial Officer in March 2021 and brings 20 years of finance, accounting and operations experience with multi-national companies in the Healthcare and Technology sector. Prior to joining BillionToOne, he served as SVP Finance at Guardant Health from July 2019 to March 2021, helping scale the finance organization for a growing public company. Between April 2009 to July 2019, he held various senior finance leadership positions with multi-national public companies including Quotient Technology, KLA Corporation and Oracle Corporation. Earlier in his career, he worked at PricewaterhouseCoopers serving clients in both public and private sectors. He holds a Bachelor’s in Commerce from Delhi University, India and is a CFA Charterholder, Certified Public Accountant licensed in California and Chartered Accountant from India.

He is passionate about building high-performing teams as well as using automation to drive scale and continuous improvement in finance operations for high-growth companies.

Nancy Johnson, MT(ASCP)


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. Nancy joins BillionToOne from Foundation Medicine where she played an instrumental role in the company’s commercial strategy and execution, building and leading her sales team to success. Prior to Foundation Medicine Nancy 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

Shan Riku, MBA


Shan is passionate about launching life-changing products and delivering seamless end-to-end user experience through the products. Shan has 10+ years of experience in launching wide range of products and brands, from online marketplace to cord blood banking and is responsible for all aspects of product at BillionToOne. Shan started her career at McKinsey & Co., where she helped launch two pharmaceutical drugs and a new brand line of high-end audio products for multinational corporations. Shan holds MBA from Stanford University, MPA/ID from Harvard University, and BS in Chemistry and Minor in Biology from Massachusetts Institute of Technology (Phi Beta Kappa).

Carrie McGehee


Carrie McGehee recently joined the BillionToOne team as the VP of Market Access, bringing over 20 years of experience working with molecular diagnostic companies. Carrie 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 started her career in healthcare as a neonatal intensive care and pediatric nurse. She spent 11 years at Genzyme Genetics, where she gained a greater understanding of how advanced diagnostics can improve all aspects of wellness and disease. Carrie has held several leadership positions with molecular diagnostics companies, including 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 is passionate about expanding access to novel diagnostic tests resulting in improved diagnostic accuracy and treatment.

John ten Bosch, PhD, FACMG

Senior Laboratory Director

John 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.

Jennifer Hoskovec, MS, CGC


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 and 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 received her BS in Biology with a minor in Chemistry from Truman State University.

Brent Kirk


Brent 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 startups with hyper-growth plans from series A through IPO. Brent graduated from Arizona and has a history of success in the tech and biotech industry.

David Peterson


With over 23 years in the healthcare industry, David is an innovative and strategic business executive with experience leading market access strategy, reimbursement, and managed care initiatives to drive growth.

David is recognized for securing coverage and target reimbursement for new technology and focus tests. He is a trusted advisor to key stakeholders, senior management, and cross-functional teams in evaluating new opportunities.

David identifies and develops system efficiencies and automation while hiring, engaging, and retaining top talent to achieve business goals through coaching, collaboration, and mentoring.

Brett Huff


Brett brings a wide variety of experience in Engineering Leadership to BillionToOne. He led part of the engineering department on Trello through its high growth phase, acquisition, and establishment as a market dominator. Previous to that led the Equities Exchange and Equities System Test teams at Goldman Sachs, responsible for accurately and quickly performing billions of dollars worth of trades every day across all stock and options exchanges throughout the Americas.

Brett started his career building and commercializing a computer network in an oil and gas drill pipe, drastically increasing the safety, speed, and accuracy of oil and gas exploration. He received his Bachelor’s degree in Computer Science with a Minor in Physics from Brigham Young University and his Master’s of Business Administration degree from the University of Utah.

Cortney Cino


Cortney is dedicated to ensuring BillionToOne’s products have a clear, compelling, and credible story. She’s passionate about our products and growing awareness and education. She joined us in January 2022 and brings tremendous marketing experience from both her most recent role as a marketing consultant to several biotechs in the Bay Area and her previous roles at Gilead and Natera. Cortney helped launch a new HIV regimen at Gilead by leading media and disease education for HCPs. At Natera, she was responsible for all aspects of marketing for multiple prenatal products. She started her career in management consulting with Booz Allen Hamilton in Washington DC. Cortney holds a bachelor’s degree in communications from UC Santa Barbara and an MBA from Boston College.

Dr. Gary Palmer


Dr. Palmer joined BillionToOne in March 2022 in a part-time capacity. 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.

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