Dr. Thomas H. Lee is an internist and cardiologist, and is network president of Partners Healthcare System and chief executive officer for Partners Community HealthCare, Inc., the integrated delivery system founded by Brigham and Women's Hospital and Massachusetts General Hospital. From the organization's inception until becoming the CEO, Dr. Lee served as Partners' chief medical officer.

Dr. Lee is professor of medicine at Harvard Medical School and a professor of health policy and management at Harvard School of Public Health. He is the editor-in-chief of the Harvard Heart Letter and associate editor of the New England Journal of Medicine.

Dr. Lee is co-chair of the Committee for Performance Measures of the National Committee for Quality Assurance (NCQA) and has been the chairman of NCQA's Cardiovascular Measurement Advisor Panel since 1996. He is a member of the boards of Bridges to Excellence and the Massachusetts Health Quality Partnership.