Murray B Stein, M.D., F.R.C.P.C., is Professor of Psychiatry at the University of California San Diego (UCSD), and Director of the Anxiety & Traumatic Stress Program at UCSD and at the Veterans Affairs San Diego Healthcare System. His research interests include social phobia, panic disorder, and posttraumatic stress disorder. Dr. Stein has published over 150 articles on these topics in professional journals such as "The Lancet" and the "Journal of the American Medical Association". He is also a member of the Scientific Advisory Board of the Anxiety Disorders Association of America. Dr. Stein lives in San Diego.

John R. Walker, Ph.D., is a registered clinical psychologist and Director of the Anxiety Disorders Program at St. Boniface General Hospital in Winnipeg, Canada. He is also Professor of Clinical Health Psychology at the University of Manitoba and supervises senior clinical psychology students in their training in treatment of anxiety disorders. He is an editor of "Panic Disorder and Agoraphobia: A Comprehensive Guide for the Practitioner" and has written chapters on social anxiety disorder and treatment of intense illness worries. Dr. Walker has a special interest in self-help approaches to treatment of anxiety disorders and has completed treatment evaluation studies demonstrating the benefits of self-help materials with panic disorder and social phobia. He lives in Winnipeg.