T. Mark Harwood, PhD, is the former Director of Clinical Training and Core Faculty in Wheaton College's Doctoral Program in Clinical Psychology. He has had extensive experience as a clinician, investigator, faculty member, and administrator, and has published widely in professional journals and textbooks, with a primary focus on psychotherapy outcome research. He is currently in private practice in St. Charles, Illinois.

Larry E. Beutler, PhD, is the William McInnes Distinguished Professor and former Chair of the PhD Programs at Palo Alto University's Pacific Graduate School of Psychology. He is also Consulting Professor of Psychiatry and Behavioral Sciences at Stanford University School of Medicine. Dr. Beutler is a Fellow of the American Psychological Association and the American Psychological Society and is the author of 23 books and over 400 scholarly papers and chapters.

Gary Groth-Marnat, PhD, ABPP, ABAP, is Professor of Clinical Psychology at Pacifica Graduate Institute and a psychologist in private practice in Santa Barbara, California. He is the author of 150 chapters/journal articles and four books. Dr. Groth-Marnat is a Fellow of the American Psychological Association (Division 12), Fellow of the Society for Personality Assessment, Diplomate of the American Board of Professional Psychology, Diplomate of the American Board of Assessment Psychology, and recipient of numerous awards.