A photograph of Dr. Sony Sierra.

Dr. Sony Sierra, MD, FRCSC, REI (She/Her)

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 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 the immediate 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 (ARSM), 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

"When I was in medical school, I thought I wanted to be a surgeon until I met a group of people who mentored me, first in the field of gynecology and women's health, and later in recurrent pregnancy loss and infertility. Then, and now, I find it fascinating. We have an amazing team at TRIO, and there are so many ongoing advances in technology so it’s an environment of constant learning. Above all, it’s so rewarding when patients achieve their desired pregnancies. I love working with individuals and couples and being part of their journey to create the family of their dreams."