About
Dr. Margaret Ryan is a board-certified endocrinologist who joined Well by Messer in 2023. Her mother was a physician and inspired her to pursue a career in medicine. Dr. Ryan graduated from Williams College and attended NYU School of Medicine. She completed her internal medicine residency at Mount Sinai Hospital. Her fellowship in endocrinology took place at Thomas Jefferson University Hospital. Before moving to New York, she practiced for 13 years in Philadelphia. There, she served as head of endocrinology at Riddle Memorial Hospital.
Education & Training
Undergraduate
Williams College
Medical School
NYU School of Medicine
Residency
Residency in Internal Medicine at Mount Sinai Hospital
Fellowship
Fellowship in Endocrinology, Diabetes and Metabolism at Thomas Jefferson University Hospital
Certifications
Conditions Treated
Who is Dr. Ryan right for?
Dr. Ryan is an excellent match for patients managing complex hormonal conditions. She has extensive experience with obesity, PCOS, and the menopausal transition. Women seeking a knowledgeable and compassionate partner for their health find her approach effective. Her background includes managing thyroid dysfunction, osteoporosis, and pituitary disorders.
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EndocrinologyFrequently Asked Questions
Dr. Margaret Ryan has extensive experience managing a wide range of endocrine disorders. Her areas of focus include obesity, polycystic ovary syndrome (PCOS), and the menopausal transition. She also treats thyroid dysfunction, osteoporosis, diabetes, and pituitary disorders.
Dr. Ryan has been a private practice endocrinologist since 2009. Prior to joining Well by Messer, she practiced in the Philadelphia area for 13 years. During that time, she served as the Head of the Division of Endocrinology at Riddle Memorial Hospital.
Yes, Dr. Ryan has received numerous accolades. Castle Connolly included her in its Top Doctors list for the Philadelphia Metro area from 2013 to 2024. She has also been a recipient of the Castle Connolly Exceptional Woman in Medicine Award since 2020.
Dr. Ryan holds board certifications in both Internal Medicine and Endocrinology, Diabetes and Metabolism. Her training includes a residency at Mount Sinai Hospital and a fellowship at Thomas Jefferson University Hospital.
Dr. Ryan was inspired by her mother, who was also a physician. Seeing her mother's fulfilling life in medicine motivated Dr. Ryan to follow a similar path. She brings that lifelong passion to her patient care.
Doctor profile last updated June 12, 2026