John D PrestonJohn D. Preston, PsyD, ABPP, (1950-2020), was a licensed psychologist, and author or coauthor of twenty books. He was professor emeritus of psychology at Alliant International University, and served on the faculty of the UC Davis School of Medcine. Preston lectured widely in the United States and abroad. He was a recipient of the Mental Health Association's President's Award for contributions to the mental health professions, and was a fellow of the American Psychological Association. Read More Read Less