Bessel van der Kolk is a Boston-based Dutch-American psychiatrist, author, researcher, and educator. Since the 1970s, his research has focused on post-traumatic stress. He is the author of four books, including "The Body Keeps the Score," a New York Times best seller translated into 43 languages. Van der Kolk is a professor of psychiatry at Boston University School of Medicine and president of the Trauma Research Foundation in Brookline, Massachusetts.