Mary M. Lee, MD, FAAP

Chief Scientific Officer
Physician-in-Chief, Delaware Valley Operations
Dr. Mary M. Lee, Enterprise Vice President and Physician-in-Chief for Nemours Delaware Valley Operations

Dr. Mary M. Lee is Nemours Enterprise Chief Scientific Officer and Head of Research. She is an accomplished academic and a recognized national leader in pediatric research. She also serves as Physician-in-Chief for Nemours Delaware Valley Operations and is a member of the Executive Cabinet reporting to Nemours President and Chief Executive Officer, R. Lawrence Moss, MD. Her medical leadership role includes responsibilities for Nemours/Alfred I. duPont Hospital for Children, Nemours hospitalists serving affiliated hospitals, as well as physician practices throughout Delaware, Pennsylvania, New Jersey and Maryland. Dr. Lee also serves as Nemours Enterprise Chief Scientific Officer and Head of Research. She is an accomplished academic and a recognized national leader in pediatric research.

Prior to joining Nemours, Dr. Lee served as Physician-in-Chief, and Professor and Stoddard Chair of Pediatrics at UMass Memorial Children’s Medical Center and University of Massachusetts Medical School. Dr. Lee also previously served as Vice Chair of Faculty Affairs in the Department of Pediatrics and Chief of Pediatric Endocrinology at the University of Massachusetts; and she has held faculty positions at Massachusetts General Hospital/Harvard Medical School and Duke University Medical School.

Dr. Lee received her MD from SUNY-Buffalo School of Medicine, was an intern and resident in Pediatrics at Children's Hospital of Buffalo, a fellow in pediatric endocrine and metabolism at Children's Hospital of Philadelphia, and a research fellow with the Pediatric Surgery Developmental Biology Laboratories at Massachusetts General Hospital. She brings strong operational, financial and strategic leadership experience to Nemours, having served for 13 years in academic, clinical and administrative leadership roles. She has a history of funded and published research, significant faculty recruitments and promotions, improving physician and nursing engagement, resolving tensions to build collaboration, and much more. Under her leadership, the Department of Pediatrics achieved an 85 percent response rate on the (Advisory Board) physician engagement survey, with significant improvement in the satisfaction rate during her tenure as chair.

Active in her field, she is the current president of the Pediatric Endocrine Society, and serves the Association of Medical School Pediatric Department Chairs on both the Program Planning and the New Chairs committees. Dr. Lee served on several NIH study sections and on the Scientific Advisory Council for NIEHS. Dr. Lee is also a member of the American Pediatric Society and the Society for Pediatric Research, and is the immediate past president of the Society of Andrology. She has been recognized among the Best Doctors of America (2005–2017), the Castle Connelly Central Massachusetts Top Doctors (2013–2017), Top Pediatricians in America (2012–2015), and was on the sub-board of Pediatric Endocrinology for the American Board of Pediatrics.

Dr. Lee was born in Taiwan and raised in upstate New York. Her undergraduate major at Harvard was in East Asian languages and culture. It was teaching children with learning disabilities in an after-school program that sparked her interest in figuring out the “why” of such challenges and why she decided to attend medical school.