He earned his doctorate degree in clinical psychology from Duke University and completed an internship at Boston Children's Medical Center. He has served as president of the American Psychological Association Division of Psychotherapy and edited the division's journal, Psychotherapy, for 10 years. He founded the journal Professional Psychology and edited the History of Psychotherapy: A Century of Change for the 100th anniversary of the American Psychological Association. He has had a part-time clinical practice for over 30 years.