Generations of Trust.
A Lifetime of Care.

Mark L. de Fazio, MD

Fellow of the American College of Obstetricians and Gynecologists · Diplomate of the American Board of Obstetrics & Gynecology

For more than three decades, Mark L. de Fazio, MD has been dedicated to providing compassionate, personalized obstetric and gynecologic care to women and families throughout Brooklyn and Staten Island. Combining exceptional clinical expertise with a warm, approachable manner, he has earned the trust of generations of patients who value the relationships built over years—and often decades—of care.

A Brooklyn native, Dr. de Fazio graduated Phi Beta Kappa and Cum Laude from the College of the Holy Cross, where he earned a Bachelor of Arts in Classics. He received his Doctor of Medicine from SUNY Downstate Medical Center before completing his residency in Obstetrics & Gynecology at The Brookdale Hospital Medical Center, where he served as Administrative Chief Resident.

In 1990, he joined the practice founded by his father, Dr. Laurence de Fazio, continuing a family tradition of caring for women that began in 1965. Today, de Fazio Obstetrics & Gynecology remains one of New York City's longest-established private OB/GYN practices and continues to serve many families across multiple generations.

In addition to private practice, he serves as an Attending Physician at NewYork-Presbyterian Brooklyn Methodist Hospital and as an Assistant Clinical Professor of Obstetrics & Gynecology at Weill Cornell Medical College. Deeply committed to medical education, he mentors residents and medical students while remaining actively involved in physician training and continuing education.

His leadership within Brooklyn Methodist Hospital has included service on numerous Medical Board committees and election as President of the Medical Board from 2020 through 2022. During the COVID-19 pandemic, he worked closely with hospital leadership to help guide the institution through one of the most challenging periods in modern healthcare.

Throughout his career, Dr. de Fazio has been recognized for both clinical excellence and community leadership. He has been named a Castle Connolly Top Doctor since 2021 and a New York Top Doctor since 2019, and was inducted into the Healer's Hall of Fame at Brooklyn Methodist Hospital. In 2023, he was honored by the Medical Society of the County of Kings for his outstanding service to the Brooklyn community.

Beyond patient care, he has served as a consultant to pharmaceutical and medical device companies and has lectured nationally on topics including maternal nutrition, nausea and vomiting in pregnancy, and menopause management. He is a past President of the Morgagni Medical Society of New York, currently serves on its Board of Trustees, and continues to chair the Society's Scholarship Committee, helping future physicians pursue medical education. He is also a member of the Medical Society of the State of New York and a Knight of the Sovereign Military Order of Malta.