Photo of Dr. Mark Leondires

Dr. Mark Leondires, MD

Concierge OBGYN physician, Norwalk, CT

Illume Fertility
5.0 (10 reviews)

Dr. Leondires founded Illume Fertility in 2002 and launched the LGBTQ+ family-building program Gay Parents To Be in 2012.

761 Main Ave, Suite 200, Norwalk, CT 06851, USA, Norwalk, CT 06851

Facts on this page last checked October 2026. How we check doctors

About Dr. Leondires

Dr. Leondires is the founder, medical director and a partner in reproductive endocrinology at Illume Fertility and Gay Parents To Be. He founded Illume Fertility in 2002 and launched Gay Parents To Be in 2012. He helps a diverse range of patients become parents, including LGBTQ+ individuals and couples.

He earned a BS at Colby College and his medical degree at the University of Vermont College of Medicine. He completed his obstetrics and gynecology residency at Maine Medical Center in Portland, Maine. He then completed a fellowship at the National Institutes of Health in Bethesda, Maryland.

Earlier, he was Director of Assisted Reproductive Technologies at the Combined Federal Program for Reproductive Endocrinology and an Assistant Professor at the Uniformed Services University of Health Sciences.

Membership and fees

Fees are not published. Ask the practice.

Education and credentials

Degree
MD
College
Colby College
Medical school
University of Vermont College of Medicine
Residency
Obstetrics and gynecology, Maine Medical Center, Portland
Fellowship
Reproductive endocrinology and infertility, National Institutes of Health, Bethesda
Board certification
Obstetrics and gynecology, and reproductive endocrinology and infertility
NPI
1063437275

Location

761 Main Ave, Suite 200, Norwalk, CT 06851, USA, Norwalk, CT 06851
Illume Fertility practice page
Directions

Recognition and research

Awards

Received Crain's 2022 Notable Healthcare Leaders Award.
Named a Castle Connolly Top Doctor for New York Metro and Fairfield County.
Selected a Best Doctor in America.

Patient reviews

5.0
10 reviews
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Write a review
Rated 5 out of 5

Great!

"Very professional care and consult."

FMDD UserNov 2024
Rated 5 out of 5

Awesome!

"Guided me in choosing the best treatment option."

FMDD UserNov 2024
Rated 5 out of 5

Amazing!

"Enlightened me about my condition."

FMDD UserNov 2024
Rated 5 out of 5

We can't thank him enough for our first child

"My husband and I started our journey with Dr. Leondires last year, and we are now expecting our first child in June. Words cannot express how grateful we are to him for going above and beyond to ensure that our journey was as smooth as possible."

FMDD UserMar 2022

Questions patients ask

Where did Dr. Leondires train?

Dr. Leondires earned his medical degree at the University of Vermont College of Medicine. He completed his residency at Maine Medical Center and a fellowship at the National Institutes of Health.

Is Dr. Leondires board certified?

Yes, Dr. Leondires is board-certified in both obstetrics and gynecology and reproductive endocrinology and infertility.

Who founded Illume Fertility?

Dr. Leondires founded Illume Fertility in 2002.

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