Winifred Mak, MBBS, PhD

Assistant Professor of Obstetrics, Gynecology, and Reproductive Sciences; Director, Early Recurrent Pregnancy Loss Program

Departments & Organizations

Obstetrics, Gynecology & Reproductive Sciences: Reproductive Endocrinology & Infertility: Fertility Center | Reproductive Sciences: Discovery to Cure Internship

Faculty Research

Stem Cell Center, Yale

Yale Medicine

Office of Cooperative Research


Yale’s Early Recurrent Pregnancy Loss (RPL) Program provides cutting-edge fertility treatments to help couples overcome pregnancy loss. As the program’s director, Dr. Winifred Mak believes in the importance of consistently incorporating new research and therapies into treatment methods. “Our goal is your goal: to achieve a healthy pregnancy,” she says.

With four offices in Connecticut—Guilford, New Haven, Westport and Stamford—the program offers, “a personalized and evidence-based approach to treatment,” according to Dr. Mak. In addition to caring for patients, Dr. Mak is also an assistant professor in the Obstetrics, Gynecology and Reproductive Sciences Department at Yale School of Medicine. She treats the full range of reproductive endocrinology diseases including infertility, RPL and polycystic ovary syndrome (PCOS), a hormonal endocrine disorder in women.

Dr. Mak received her MBBS and a PhD in Genetics from the University of London. She completed two Ob/Gyn residencies, the first at Addenbrooke's Hospital in Cambridge, England, and the second at Cedars-Sinai Medical Center in Los Angeles, California. While finishing her fellowship in Reproductive Endocrinology and Infertility at the University of Pennsylvania, she was recruited by Yale University as a Women’s Reproductive Health Research (WRHR) scholar. The national WRHR program, funded by the National Institute of Health, is a physician-scientist training program for obstetricians and gynecologists.

Dr. Mak also conducts research at the Yale Stem Cell Center, where the “Mak Lab” is set up for her ongoing use. Her interests include understanding oocyte and early embryo biology which will help patients faced with infertility issues and recurrent pregnancy loss. Through continuous research she is able to explore promising new developments and pass her knowledge along to her patients.

Dr. Mak is a member of the American College of Obstetricians and Gynecologists, the American Society for Reproductive Medicine (ASRM) and the Society for Reproductive Investigation. Dr. Mak has been honored with an ASRM research award and the Albert S. McKern Research Scholarship. This scholarship is offered by the University of Sydney in Australia to postgraduates conducting research into the cause, prevention and treatment of mental and physical pain and distress during all stages of a woman’s pregnancy.

Education & Training

PhD University of London (2004)
MBBS University of London (1997)
Fellowship University of Pennsylvania
Residency Cedars-Sinai Medical Center, Los Angeles
Residency St. Mary's Hospital
Residency Addenbrooke's Hospital
Board Certification AB of Obstetrics & Gynecology, Obstetrics & Gynecology (2012, recertified: 2016)
Board Certification AB of Obstetrics & Gynecology, Reproductive Endocrinology & Infertility (2014, recertified: 2016)

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Contact Info

Winifred Mak, MBBS, PhD
Patient Care Location
Yale Reproductive Endocrinology and Infertility150 Sargent Drive, Ste 2nd Floor
New Haven, CT 06511
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Office Location
Farnam Memorial Building
310 Cedar Street, Ste 329G

New Haven, CT 06510
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Mailing Address
Yale Obstetrics, Gynecology & Reproductive SciencesPO Box 208063
New Haven, CT 06520-8063

Mak lab