Hofmann is co-president of the Anxiety Disorders Special Interest Group of the Association for the Advancement of Behavior Therapy (AABT). Michael W. Otto, Ph.D., is a Professor in the Clinical Psychology Program at Boston University. He sits on the scientific advisory board of the Anxiety Disorders Association of American (ADAA), and is President-Elect (2004-2005) of the Association for the Advancement of Behavior Therapy. Dr. Otto is a fellow of the American Psychological Association and he serves as a section editor for Cognitive and Behavioral Practice, and on the editorial boards of Anxiety, Behavior Research and Therapy, Clinical Psychology: Science and Practice, Journal of Anxiety Disorders, Journal Watch in Psychiatry, and Psychotherapy and Psychosomatics.