Faculty Directory

Julia Marcus

Associate Professor

Julia Marcus, PhD, MPH is an infectious disease epidemiologist and Associate Professor in the Department of Population Medicine at Harvard Medical School and Harvard Pilgrim Health Care Institute, and Adjunct Faculty at The Fenway Institute. She received her doctoral degree in epidemiology from the University of California, Berkeley, and completed a postdoctoral fellowship at the Kaiser Permanente Division of Research.

Dr. Marcus’s research focuses on improving the implementation of preexposure prophylaxis (PrEP) to prevent new HIV infections and promote sexual health in the U.S. She has used electronic health record (EHR), survey, and qualitative data to identify patients who may benefit from PrEP, document clinical outcomes among PrEP users in real-world healthcare settings, and identify gaps and inequities in the PrEP continuum of care. Her studies are now cited by CDC as key evidence of the effectiveness of PrEP in clinical practice. Dr. Marcus is currently leading multiple NIH-funded implementation projects to evaluate whether predictive analytics and clinical decision support can improve PrEP prescribing in safety net clinics. Her research has also focused on hepatitis C, leading to the elimination of national race-based treatment guidelines that had restricted the use of shorter courses of therapy for Black patients.

In addition to her research, Dr. Marcus has written popular science essays for the public, including a series of articles in The Atlantic on health communication during the COVID-19 pandemic, with lessons learned from the HIV epidemic.




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