William E. Piper, Ph.D. is Professor and Co-director of the Psychotherapy Research Centre, Department of Psychiatry, University of Alberta. He is also Associate Director of the Program Evaluation and Research in the Division of External Psychiatric Services, University of Alberta Hospitals. Mary McCallum, Ph.D. is Clinical Lecturer, Department of Psychiatry, University of Alberta, and Research Associate in the Division of External Psychiatric Services, University of Alberta Hospitals. As a registered clinical psychologist, she also operates a private practice. Hassan F. A. Azim, M.B., B....