Michel Hersen, Ph.D., ABPP (State University of New York at Buffalo, 1966) is professor and dean, School of Professional Psychology, Pacific University, Forest Grove, Oregon. He completed his postdoctoral training at the West Haven VA (Yale University School of Medicine Program). He is past president of the Association for Advancement of Behavior Therapy. He has co-authored and co-edited 139 books and has published 224 scientific journal articles. He is co-editor of several psychological journals, including Behavior Modification, Aggression and Violent Behavior: A Review Journal, Clinical Psychology Review, and Journal of Family Violence. Dr. Hersen is editor-in-chief of the Journal of Developmental and Physical Disabilities, and the Journal of Anxiety Disorders, and Clinical Case Studies, which is totally devoted to description of clients and patients treated with psychotherapy. He is editor-in-chief of the 4-volume work entitled: Comprehensive Handbook of Psychological Assessment and the 2-volume work entitled: Encyclopedia of Psychotherapy. He has been the recipient of numerous grants from the National Institute of Mental Health, the Department of Education, the National Institute of Disabilities and Rehabilitation Research, and the March of Dimes Birth Defects Foundation. He is a diplomate of the American Board of Professional Psychology, fellow of the American Psychological Association, distinguished practitioner and member of the National Academy of Practice in Psychology, and recipient of the Distinguished Career Achievement Award in 1996 from the American Board of Medical Psychotherapists and Psychodiagnosticians. Finally, at one point in his career, he was in full-time private practice and on several occasions he has had part-time private practices.