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Geralyn C. O'Reilly, MD

Academic Title:

Assistant Professor

Primary Appointment:

Obstetrics, Gynecology and Reproductive Sciences


University of Maryland Medical Center 22. South Greene Street. Baltimore, MD 21201

Phone (Primary):


Education and Training

  • Washington University in St. Louis, BA, Art History, 1990
  • New York Medical College, MD, 1994
  • George Washington University, OB/GYN, PGY-1, 1995
  • University of Washington, OB/GYN, PGY-2-4, 1998
  • University of Washington, Maternal-Fetal Fellowship, 2001
  • Johns Hopkins University, Evidence-Based Teaching in Health Professions Certificate, 2023


Dr. O'Reilly graduated from New York Medical College and was inducted into the Alpha Omega Alpha Honor Society.  She completed her OB/GYN and MFM training at the University of Washington in Seattle.  She remained at the University of Washington as Assistant Professor in the Department of Maternal-Fetal Medicine until returning to the east coast and accepting an attending physician position at Sinai Hospital of Baltimore where she was actively involved in resident education.  During this time, she was recognized for her teaching efforts as the Johns Hopkins School of Medicine Outstanding OB/GYN Educator Award and the CREOG National Faculty Award for Excellence in Resident Education.  She was also recognized as a "Baltimore Magazine Top Doc" in 2015.  Dr. O'Reilly's clinical interests include medical complications in pregnancy, particularly diabetes and hypertension.  Dr. O'Reilly's academic interests include medical education and community outreach to encourage careers in the medical field.  She has been educating medical students and residents since her own years in training and has completed her certificate in Evidence-based Teaching in Health Professions from Johns Hopkins University.    She joined the Department of OB/GYN at UMMS in 2023 as an Assistant Professor.   She is a member of ACOG, SMFM and AIUM and serves on the OBGYN clerkship committee at UMMS.  In her spare time, she enjoys running, cooking and spending time with her family.

Research/Clinical Keywords

Fetal ultrasound, fetal echocardiogram, amniocentesis, medical complications in pregnancy such as diabetes and hypertension, resident mentor, lecturer to promote the medical profession to local schools and universities.

Clinical Specialty Details

Diabetes in pregnancy, Hypertensive disorders in pregnancy

Awards and Affiliations

  • Alpha Omega Alpha, 1994
  • Baltimore Magazine Top Doc, 2015
  • Johns Hopkins School of Medicine, Outstanding OB/GYN Educator Award, 2016
  • CREOG National Faculty Award for Excellence in Resident Education, 2021

Community Service

Guest speaker, local middle, high school and colleges, "Encouraging a Career in Medicine"

Franciscan Center, server