Professor of Medicine and Health Care Policy, Emeritus (since 2008), Professor of Medicine and Professor of Health Care Policy (1994-2007), Harvard Medical School. Director, Charles River Laboratories, Inc.; Fellow, American Academy of Arts and Sciences; Master, American College of Physicians; Member, Board of Overseers, Teachers Insurance and Annuity Association of America-College Retirement Equities Fund and Cornell University Weill Medical College.