In addition to his commentary on "Good Morning America," Dr. Johnson provides on-air analysis of medical news for "World News Tonight," "Nightline" and "20/20." He consults with ABC News in general regarding coverage of medical news.

Dr. Johnson holds joint positions in medicine at Harvard University and Massachusetts General Hospital in Boston, placing him in the mainstream of the nation's top medical resources. He is also the founding editor of the Harvard Medical School Health Letter and co-editor of the Harvard Medical School Health Letter Book.

Dr. Johnson's health information and advice have won him the trust of millions of Americans and national critical acclaim. He was honored with the 1993 Howard W. Blakeslee Award for three "20/20" features: "Laser's Costly Lure," "Ignored to Death" and "A Deadly Rhythm." In 1989, he was awarded the Surgeon General Medallion by Dr. C. Everett Koop for counsel, support and advice given to the Surgeon General's office, as well as the Howard W. Blakeslee Award given by the American Heart Association in recognition of his reports on "World News Tonight." He also is the recipient of Emmy Awards from the New England Chapter of the National Academy of Television Arts and Sciences. In March, 1988, he received the Lewis Thomas Award for Communications given by the American College of Physicians. Dr. Johnson was the winner of the 1986-87 William Harvey Award for "outstanding reporting on hypertension" given by the American Medical Writers Association, National High Blood Pressure Education Corporation and Squibb Corporation. His "20/20" feature entitled "Rx for Danger" earned him the 1987 Howard W. Blakeslee Award.

He is the co-editor of the book, "Your Good Health," published by Harvard Press, as well as co-author with former U.S. Surgeon General Dr. C. Everett Koop of the book, "Let's Talk," published by Zondervan in 1992.

Originally headed for the ministry, he graduated in 1963 from the North Park Seminary, but two years later decided to enter medicine. A Phi Beta Kappa graduate of Augustana College, he graduated summa cum laude from Albany Medical College and holds a Masters degree in public health from Harvard University.

Dr. Johnson and his wife, Nancy Ann, reside in the Boston suburbs. He is the father of two children, and serves as assisting minister of the Community Covenant Church in West Peabody, Massachusetts.

Need to write? Here's where to send mail to Dr. Timothy Johnson.