Dr. H. Gilbert Welch is an internist at Brigham and Women's Hospital - Center for Surgery and Public Health (go figure), and a nationally recognized expert on the effects of medical testing. He has been published by the Los Angeles Times, New York Times, Washington Post, and Wall Street Journal, as well as major medical journals, and he has appeared on network television, CNN, and NPR. Dr. Welch is the author of three books, Less Medicine, More Health; Should I Be Tested for Cancer?; and the highly acclaimed Overdiagnosed.