Mark P. Leondires, MD
Reproductive Endocrinologist, Founder and Medical Director · Illume Fertility - Norwalk, Norwalk, CT
Photo: illumefertility.com.
Years in practice: 20+ (clinic biography)
Specialty: Reproductive Endocrinology & Infertility (clinic biography)
Board certified: Obstetrics & gynecology; reproductive endocrinology & infertility (clinic biography)
Training: MD, University of Vermont; OB/GYN residency, Maine Medical Center; REI fellowship, National Institutes of Health (NIH) (clinic biography)
Focus areas: LGBTQ+ family building and donor conception; founded Illume Fertility in 2002 (clinic biography)
Contact & booking (through the clinic)
Clinic biography and contact options ↗ · clinic profile on TFI
You book directly with the clinic.
Sources
Last updated: November 6, 2026
· Clinic bio page (illumefertility.com)
· Federal NPI registry (NPI 1063437275)
· PubMed author search
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