Michael J. Lambert, Ph.D., is a Professor of Psychology and holds the Susa Young Gates University Professorship at Brigham Young University, teaching in the Clinical Psychology Program. He is also holds an honorary Professorship at the University of Queensland School of Psychology, Brisbane Australia. He has been in private practice as a psychotherapist throughout his career. His research spans 40 years and has emphasized psychotherapy outcome, process, and the measurement of change. He was the recipient of the Distinguished Psychologist Award from Division 29 (psychotherapy) of the American Psychological Association. He is editor of Bergin and Garfield’s Handbook of Psychotherapy and Behavior Change (6th edition, 2013), the most authoritative summary of the effects of psychological treatments.