Robert M. Bray, Ph.D., a fellow of the American Psychological Association, is a senior research psychologist and senior director of the Substance Abuse Epidemiology and Military Behavioral Health Program. His research interests focus on the epidemiology of substance use and other health behaviors in military and civilian populations with an emphasis on understanding the prevalence, causes, correlates, and consequences of these behaviors. He has directed nine comprehensive worldwide Department of Defense surveys of military personnel that comprise the most widely cited data on substance use and...