Timothy A Brown received his Psy.D. from the Virginia Consortium for Professional Psychology in 1988. He has published numerous scientific articles and chapters in the area of anxiety disorders. Presently, he is associate director of the Center for Anxiety and Related Disorders at Boston University and research associate/professor in the psychology department at Boston University. He has been a consultant to the National Institute of Mental Health on the evaluation of psychosocial and pharmacological treatments for anxiety disorders, and he has served as a consultant for large-scale projects focusing on the assessment and diagnosis of anxiety disorders using DSM-IV criteria. In addition, he was a member of the DSM-IV Anxiety Disorders Sub-Workgroup for generalized anxiety disorders and mixed anxiety depression. Recently, his research has focused on the classification of anxiety disorders, the development and evaluation of short- and long-term outcome of psychosocial treatments for anxiety disorders, and the nature and assessment of panic and generalized anxiety disorder.

Peter A. DiNardo received his PhD in Clinical Psychology from Washington University in 1974. He is presently a professor of psychology at the State University of New York, College at Oneonta, and he has been a consultant to the Phobia and Anxiety Disorders Clinic at the Center for Stress and Anxiety Disorders since 1982. His current research interests include diagnostic reliability of DSM-IV anxiety disorders and etiological factors in specific phobias. David H. Barlow received his Ph.D. from the University of Vermont in 1969 and has published over 400 articles and chapters and over 20 books.

His major interests over the past 30 years has been the study of anxiety and its disorders, and developing new psychological procedures for practice settings. Prior to his current position as Professor and Director of the Center for Anxiety and Related Disorders and Director of Clinical Psychology Programs at Boston University, he founded clinical psychology internships at Brown University and the University of Mississippi Medical Center. He is the recipient of the 2000 American Psychological Association (APA) Distinguished Scientific Award for the Applications of Psychology. Other awards include the Career Contribution Awards from the Massachusetts and California Psychological Associations, and a MERIT award from the National Institute of Mental Health for long-term contributions to the clinical research effort. During the 1997/1998 academic year, he was Fritz Redlich Fellow at the Center for Advanced Study in Behavioral Sciences in Palo Alto, California. He is Past-President of the Society of Clinical Psychology of the American Psychological Association, and the Association for the Advancement of Behavior Therapy. He was also Chair of the American Psychological Association Task Force of Psychological Intervention Guidelines, a member of the DSM-IV Task Force of the American Psychiatric Association, and was Co-Chair of the Work Group for revising the anxiety disorders categories.