The Mongan Institute is a community of leading scientists and programs in population and health care delivery science dedicated to transforming health care and achieving health equity locally, nationally, and globally. The Mongan Institute's research and training program is based in the Department of Medicine at Massachusetts General Hospital with collaborations across MGH, Partners HealthCare, the Harvard T.H. Chan School of Public Health (HSPH), and Harvard Medical School (HMS). Spanning data science to delivery science, and evaluative science to implementation science, the Mongan Institute is uniquely positioned to leverage the extraordinary research environment of MGH, as well as national and international collaborators, to solve the most intractable challenges in health care.