Dr Segal is a top San Francisco Bay Area Fertility Specialist and stands at the forefront of reproductive medicine. She is double board-certified in Reproductive Endocrinology and Infertility and Obstetrics and Gynecology. She is known for her deep commitment to her patients and has helped thousands of families overcome infertility and welcome babies into their lives. With more than a decade of experience, Dr. Segal's expertise includes fertility preservation (egg/embryo freezing), individualized in vitro fertilization (IVF) protocols, preimplantation genetic diagnosis, PCOS, recurrent pregnancy loss, LGBTQ family building, and more.

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Dr. Segal founded Collab Fertility to address the growing need for quality fertility care in the East Bay. She believes her patients deserve the best clinical outcomes with access to state-of-the-art facilities and an experienced care team. Since coming to the East Bay, Dr. Segal has joined the staff at John Muir.

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Prior to founding Collab Fertility, Dr. Segal was an Assistant Professor at UCSF Center for Reproductive Health (ranked #1 in California by Newsweek during her tenure) where she garnered extensive experience diagnosing and treating the causes of infertility. A passionate advocate for reproductive health, she has worked to raise awareness of the impact of environmental toxins on fertility, serving as the former Chair of the Environment and Reproduction Special Interest Group for the American Society for Reproductive Medicine (ASRM). She is also deeply committed to education and mentorship as a member of the Society for Reproductive Endocrinology and Infertility (SREI) Resident Education Committee.

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Dr. Segal's research focuses on the intersection of environmental exposures and reproductive health. She has authored key publications, including the environmental chapter in Reproductive Endocrinology by Yen & Jaffe, a cornerstone textbook in the field.

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She is originally from New Jersey and when not in the clinic, she enjoys discovering Bay Area hikes and beaches with her husband and three young boys.

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Thalia Segal is such an amazing, compassionate and caring Doctor. You won’t feel like a number you will feel like a person and heard. You will have customized care and not have to repeat testing already completed by other Doctors. Nurses front desk and lab staff were all friendly and welcoming! - KELLY LEHL

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My husband and I are absolutely blown away by Collab Fertility and Dr. Segal! From our first meeting, I was immediately struck by her compassion, clear expertise, kindness, and exceptional communication. Having been through the difficult process of IVF for over a year and using two other clinics, I speak from experience that there is NO ONE better than Dr. Segal and her clinic. We hope that through our own experience, others can benefit in their fertility journey like we finally now are. - LISSA AND JUSTIN

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Dr. Segal and her staff are absolutely amazing. I came to Dr. Segal feeling very scared about my fertility options. She listened to my concerns, reassured me, and worked with me to create a plan that made me feel secure about my future. She has taken the time to educate me—I’ve learned so much about fertility health and the options available through her. -SHERISE

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Thalia R. Segal, MD, Founder and Medical Director of Collab Fertility, gives a tour of the clinic and state-of-the-art IVF lab. Collab Fertility offers comprehensive fertility assessment, counseling, and treatment options including egg freezing, IVF, genetic testing, PGT, hysterscopy, sperm and egg donors, and gestational carriers and intrauterine insemination. We welcome and celebrate all family structures.