Zindel V. Segal, Ph.D., is Head of the Cognitive Behavioral Therapy Unit at Clarke Institute of Psychiatry in Toronto, and Associate Professor of Psychiatry and Psychology at the University of Toronto. A coauthor of "Interpersonal Process in Cognitive Therapy" (with Jeremy D. Safran), Dr. Segal's research interests are in the areas of cognitive vulnerability to relapse in unipolar depression and the assessment of changes in self-representation following treatment. Sidney J. Blatt, Ph.D., is Professor of Psychiatry and Psychology at Yale University and Chief of the Psychology Section in the...