Jon E. Grant, JD, MD, MPH, is a professor of psychiatry at the University of Chicago and the coauthor of Stop Me Because I Can't Stop Myself: Taking Control of Impulsive Behavior. Brian L. Odlaug, PhD, MPH, is a visiting researcher in public health at the University of Copenhagen. Samuel R. Chamberlain, MD, PhD, is a clinical lecturer and psychiatrist at the University of Cambridge. Drs. Grant, Odlaug, and Chamberlain are the authors of Clinical Guide to Obsessive Compulsive and Related Disorders.