A well-known American doctor and medical educator presents a succinct review of medical care and education in the United States since 1900. The author begins with the revamping of medical education at the turn of the century, then discusses the growing conservatism of the American Medical Association (AMA) during the Depression and World War II. He describes the trend toward specialization, which fostered the growth of professional societies outside the AMA and led to complex government-university research programs, and concludes with a survey of recent health legislation and a look at the future.