He is also the co-author of the books Sway and Click.George E. Vaillant, M.D., is a psychoanalyst and a research psychiatrist, one of the pioneers in the study of adult development. He is a professor at Harvard University and directed Harvard’s Study of Adult Development for thirty-five years. He is the author ofAging WellandThe Natural History of Alcoholism, and his 1977 book,Adaptation to Life, is a classic text in the study of adult development. He lives in Boston; East Thetford, Vermont; and Victoria, Australia.