David J. Cain, PhD, ABPP, is the editor of Humanistic Psychotherapies: Handbook of Research and Practice (2002) and Classics in the Person-Centered Approach (2002). A former colleague of Carl Rogers, he is the founder of the Association for the Development of the Person-Centered Approach and the founder and editor of the Person-Centered Review. He has been a member of the editorial boards for the Journal of Humanistic Psychology, The Humanistic Psychologist, and Person-Centered and Experiential Psychotherapies. Dr. Cain is a past president of the Society for Humanistic Psychology and a diplomate and fellow with the American Board of Professional Psychology. He maintains a private practice in Carlsbad, CA.

David Murphy, PhD, is a chartered psychologist, full member of the Division of Counselling Psychology and associate fellow of the British Psychological Society, and member of the General Psychotherapy Council. He is professor of psychology and education at The University of Nottingham, England and is the director for the Centre for Research in Human Flourishing. His previous books include the Person-Centred Experiential Counselling for Depression Third Edition and the Person-Centred Experiential Counselling for Depression Second Edition, and Counselling Psychology: A Textbook for Study and Practice. Additionally, he has published over 90 articles and book chapters in the fields of counseling, psychotherapy, and education and served as editor of the journal Person-Centered & Experiential Psychotherapies.