Dr. James Januzzi has been a member of the Massachusetts General Hospital Cardiology Division since 2000. He is the Hutter Family Professor of Medicine at Harvard Medical School and serves as Chief Scientific Officer and C. Michael Gibson Chair at the Baim Institute for Clinical Research.

Dr. Januzzi graduated as the top-ranked student at New York Medical College in 1994 and subsequently completed a residency in Internal Medicine at Brigham and Women's Hospital, followed by a fellowship in cardiology and echocardiography at Massachusetts General Hospital. Since joining the staff at MGH, his clinical focus has been heart failure and chronic coronary artery disease. He has been named among the "Best in Boston" for his clinical work and has served as Cardiology Consultant to the Boston Red Sox since 2005.

His research focuses on diagnostics and therapeutics in cardio-kidney-metabolic disease, with a notable emphasis on heart failure. Dr. Januzzi has published more than 1,000 manuscripts, edited five textbooks, and is routinely among the top 1% most cited researchers in cardiology. He received the Distinguished Clinical Researcher award from the American College of Cardiology in 2025.