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  • Cornell University - BA
  • Albert Einstein College of Medicine - MD
  • Northwell Health - OB/GYN residency
  • Case Western Reserve University/ University Hospitals Cleveland Medical Center - REI fellowship
Active Research projects
  • Impact of wildfire smoke on fertility and pregnancy
  • Regulation of embryonic diapause in the Northern Elephant Seal (in collaboration with UCSC)
  • Impact of plastics and climate change  on reproductive health

Thalia R. Segal, MD

Founder and Medical Director

Dr. Segal 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.

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.

Prior to starting Collab Fertility, Dr. Segal was an Assistant Professor at UCSF Center for Reproductive Health (named America’s best by Newsweek during her tenure) where she garnered extensive experience diagnosing and treating the causes of infertility. She passionately advocates for greater awareness of the impact of environmental toxins on fertility and reproductive health as the former Chair of the Environment and Reproduction Special Interest Group, a committee of the American Society for Reproductive Medicine (ASRM). She also enjoys teaching and is a Society for Reproductive Endocrinology and Infertility (SREI) Resident Education Committee member.

Dr. Segal has authored influential publications - including the environmental chapter in the cornerstone textbook, Reproductive Endocrinology by Yen & Jaffe. She is also actively involved in a number of research projects for which she has received several research grants and awards.

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.