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 reveals the strengths and weaknesses of each analytic approach. He combines techniques from the fields of statistics, biostatistics, demography and epidemiology to present a comprehensive overview that does not require computational details of the statistical techniques described. For the Third Edition, Selvin took out some old material (e.

g. the section on rarely used cross-over designs) and added new material (e.g. sections on frequently used contingency table analysis).Th roughout the text he enriched existing discussions with new elements, including the analysis of multi-level categorical data and simple, intuitive arguments that exponential survival times cause the hazard function to be constant. He added a dozen new applied examples to illustrate such topics as the pitfalls of proportional mortality data, the analysis of matched pair categorical data, and the age-adjustment of mortality rates based on statistical models. The most important new 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.