H. Gilbert Welch MD, MPH is professor of Medicine at the Dartmouth Institute for Health Policy & Clinical Practice. His research has focused on the problems created by medicine's efforts to detect disease early: physicians test too often, treat too aggressively and tell too many people that they are sick. Much of his work has focused on overdiagnosis in cancer screening: in particular, screening for melanoma, thyroid, lung, breast and prostate cancer. His first book, SHOULD I BE TESTED FOR CANCER? Maybe not and here's why (UC Press 2004) was written while he was a Visiting Scientist at the International Agency for Research on Cancer and was one of the six "best books" listed by Malcolm Gladwell in The Week.