John Preston, Psy.D, ABPP is professor emeritus with Alliant International University, California School of Professional Psychology. He has also taught with the University of California at Davis, School of Medicine. Dr. Preston is the author of 21 books on various topics including: Integrative Brief Therapy: Cognitive, Psychodynamic, Humanistic and Neurobehavioral Approaches and Handbook of Clinical Psychopharmacolgy for Therapists. He has lectured in the United States, Europe, Canada, Africa and Russia.