Dr. Mark P. Leondires is the Founder, Medical Director and Partner in reproductive endocrinology at Illume Fertility and Gay Parents To Be. He is board-certified in both Obstetrics and Gynecology and Reproductive Endocrinology and Infertility.

He has served as a member of RESOLVE's Physician Council and as Chair of ASRM's LGBTQ Special Interest Group. Dr. Leondires has been selected as a Castle Connolly "Top Doctor" in CT & NY for many consecutive years.

For Dr. Leondires, medicine offers an opportunity to solve problems; each fertility patient presents a unique puzzle. This, combined with a wide range of interests and life events, is how Dr. Leondires came into reproductive endocrinology and infertility and started his own fertility practice.