Donald W. Black, MD, is Professor of Psychiatry at the University of Iowa College of Medicine in Iowa City. A graduate of Stanford University and the University of Utah School of Medicine, he has received numerous awards for teaching, research, and patient care, and is listed in "Best Doctors in America." He writes extensively for professional audiences, and his work has been featured on 20/20, Dateline, and 48 Hours. C. Lindon Larson is a writer and editor and lives in Iowa City.