Dr. Timothy Johnson (M.D., M.P.H.) is the medical editor for ABC News and has reported on health-care issues for Good Morning America since 1975. He also provides on-air analysis of medical news for World News Tonight, Nightline and 20/20. Johnson holds joint positions in medicine at Harvard University and Massachusetts General Hospital in Boston, and serves as assisting minister of the Community Covenant Church in West Peabody, Massachusetts.