Peter L. Slavin, MD became the President of Massachusetts General Hospital on January 1, 2003. From 1999-2002, he served as Chairman and Chief Executive Officer of the Massachusetts General Physicians Organization, which included over 1,700 physicians and employed nearly 1,000 of them. From 1997 to 1999, Slavin served as President of Barnes-Jewish Hospital in St. Louis, Missouri. Before that, he did his training in Internal Medicine at Massachusetts General Hospital from 1984 to 1987 and was Senior Vice President and Chief Medical Officer from 1994 to 1997.

Slavin graduated from Harvard College in 1979, Harvard Medical School in 1984, and Harvard Business School in 1990. Slavin teaches internal medicine and health care management at Harvard Medical School where he is a Professor of Health Care Policy. He serves on the Boards of American Well (a telemedicine company) and the Geisel Dartmouth Medical School Board of Overseers.