Michael J. Lambert, PhD, is a professor of psychology at Brigham Young University and holds the Susa Young Gates University Professorship. He also holds an honorary professorship in the School of Psychology at the University of Queensland, Brisbane, Australia. He has been in private practice throughout his career. His research spans 38 years, emphasizing psychotherapy outcome and the measurement of change. He has edited, authored, or coauthored nine academic research-based books and 40 book chapters and has published more than 150 scientific articles on treatment outcome. Dr. Lambert received Brigham Young University's highest honor for faculty research, the Maeser Award, in recognition of his cumulative research accomplishments and the Distinguished Psychologist Award from Division 29 (Psychotherapy) of the American Psychological Association. In 2003, he was the recipient of the Distinguished Career Research Award from the Society for Psychotherapy Research for his lifetime contributions to research on professional practice. In 2004, he edited Bergin and Garfield's Handbook of Psychotherapy and Behavior Change, the most authoritative summary of the effects of psychological treatments. His current research focuses on reducing treatment failure and nonresponse through the use of advanced statistical methods and computer applications.