Advancing Prenatal Genetics, Together.

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.

jhoskovec@billiontoone.com

Rachel Doyel is a board-certified, licensed genetic counselor with extensive clinical and industry experience in prenatal and reproductive genetics. She joined BillionToOne in January 2023. After beginning her career in clinical genetic counseling, Rachel transitioned to a medical science liaison role at Ariosa Diagnostics, where she supported education and implementation of the Harmony Prenatal Test, with an emphasis on equitable access to noninvasive prenatal testing for aneuploidy. She later expanded her expertise in women’s health at Sema4, providing educational and clinical support across a broad portfolio of reproductive molecular diagnostics. Rachel earned her master’s degree in medical and molecular genetics from Indiana University and is an active member of the Indiana Network of Genetic Counselors.

rdoyel@billiontoone.com

kfaler@billiontoone.com

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Vicky Hsieh, MS, CGC is a board-certified genetic counselor and Medical Science Liaison at BillionToOne. Prior to joining BillionToOne, she spent eight years at SUNY Downstate Medical Center, where she served as Director of Genetic Services and gained extensive experience in prenatal genetics, newborn screening, and the clinical application of genetic testing across specialties. In her current role, Vicky partners with healthcare providers to provide education on emerging technologies and advances in prenatal genetic screening and testing.

vhsieh@billiontoone.com

Paul Hudson, MS, CGC, is a Principal Medical Science Liaison at BillionToOne, where he supports scientific education and clinical engagement surrounding Unity's innovative prenatal genetic screening technologies. A certified genetic counselor and former President of the Ohio Association of Genetic Counselors, Paul brings a strong foundation in clinical genetics, professional leadership, and medical education. Before joining BillionToOne, he practiced as a genetic counselor at Premier Health and held an academic appointment at The Ohio State University. His professional interests include integrating genetic counseling into multidisciplinary healthcare teams, advancing prenatal genetics education, and helping clinicians navigate evolving screening technologies. Paul earned both his bachelor's and master's degrees from The Ohio State University.

phudson@billiontoone.com

Caitlin Mann, MGC, CGC is a Prenatal Medical Science Liaison at BillionToOne. Prior to joining BillionToOne, she spent 11 years at Vanderbilt University Medical Center in the Division of Maternal-Fetal Medicine, serving as both a clinical genetic counselor and Assistant Director of Obstetrical Genetic Counseling. Caitlin earned a B.A. in Biology and Spanish from Illinois Wesleyan University in 2012 and a Master of Genetic Counseling from the University of Maryland in 2014. Originally from Chicago, she has called Nashville, TN home for more than a decade. She is passionate about reproductive justice and advancing equitable, patient-centered care in women’s health, a commitment that continues to shape the work she pursues.

cmann@billiontoone.com

Natalie Richeimer is a board certified genetic counselor and Medical Science Liaison with BillionToOne and Unity. She holds a master's degree in human genetics and genetic counseling from the Keck Graduate Institute. Natalie is a native Torontonian, who lives in Los Angeles with her husband and three boys. She has published research in the Journal of Genetic Counseling. She is passionate about reproductive health education and community engagement. Natalie has a special interest in outreach, aiming to increase awareness of and access to genetic counseling.

nricheimer@billiontoone.com

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Alyssa Stringfellow is a certified genetic counselor and Medical Science Liaison with BillionToOne and the UNITY screen. She is based in Seattle, WA, and completed her Masters of Genetic Counseling at South Carolina Genetic Counseling Graduate Program in 2019. Prior to joining BillionToOne in 2024, she was a clinical genetic counselor with the Genetic Support Foundation, serving multiple Maternal Fetal Medicine clinics throughout the Pacific Northwest, and Kaiser Permanente Washington from 2019-2024.

astringfellow@billiontoone.com

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Bethany Tucker is a certified genetic counselor who joined BillionToOne in 2021 and now serves as a senior medical science liaison. She brings more than 25 years of experience spanning prenatal and pediatric genetics, fetal care, and population-based genomic screening. Before joining BillionToOne, Bethany held senior roles at Sanford Health and the Colorado Fetal Care Center, with earlier experience at the University of Colorado and Reproductive Genetics Center. She earned both her MS in Genetic Counseling and her MBA from the University of Colorado.

btucker@billiontoone.com