Dr. Sony Sierra, MD, FRCSC (OBGYN/REI)
Reproductive Endocrinology & Infertility Specialist (REI), Deputy Medical Director and Partner
For close to 20 years, Dr. Sony Sierra has been a Reproductive Endocrinologist and Infertility Specialist, as well as a specialist in recurrent pregnancy loss. Alongside her role as Deputy Medical Director and Partner at TRIO, Dr. Sierra is the Medical Director at EVOLVE Egg Freezing Clinic. In addition to her fertility practice, Dr. Sierra and Dr. Carl Laskin also run the early Recurrent Pregnancy Loss (RPL) program — the largest program of its kind in Canada.
Dr. Sierra is an Associate Physician at Women’s College Hospital and an Assistant Professor of Obstetrics and Gynecology in the Division of Reproductive Endocrinology and Infertility at the University of Toronto. She is certified by the Royal College of Physicians and Surgeons of Canada in both Obstetrics and Gynecology (OB-GYN) and in Gynecologic Reproductive Endocrinology and Infertility (GREI).
She has been published in peer-reviewed journals and authored chapters in prestigious textbooks, as well as presented papers at national and international conferences. Her current research interests include infertility, recurrent pregnancy loss, implantation failure, and PCOS.
Dr. Sierra is a Past President of the Canadian Fertility & Andrology Society (CFAS) 2022-2023, and a founding member of the Guidelines for Practice Committee. She is also an active member of the American Society for Reproductive Medicine (ASRM), previous chair of the Early Pregnancy Special Interest Group (2016-2017); and the European Society of Human Reproduction and Embryology (ESHRE). Dr. Sierra believes that involvement and participation in these established and well-respected societies will ensure expertise and up-to-date knowledge that she can pass on to her patients.
Dr. Sierra is committed to providing excellence in the management of infertility and pregnancy loss with a gentle and compassionate approach.
Why I Love Being A Fertility Doctor
"In medical school I was fortunate enough to be mentored in the field of gynecology and women’s health, and later in recurrent pregnancy loss and infertility. What began as curiosity quickly became a calling—and one that continues to inspire me every day. Fertility medicine is deeply personal. It blends science, hope, and resilience, and it requires listening as much as it does medical expertise. I am grateful to work alongside an extraordinary team at TRIO, in a field that is constantly evolving and pushing the boundaries of what is possible. What matters most to me, however, is the human side of this work. I have the privilege of caring for individuals and couples during some of the most vulnerable moments of their lives. Walking with patients through uncertainty, loss, and ultimately joy, and being part of their journey toward building the family they have dreamed of, is the most meaningful work I can imagine."