Nathan H. Azrin, Ph.D., is the father of four children and a leading authority on the psychology of learning. He received his Ph.D. from Harvard University, was a research associate at the Boston University School of Medicine, and has been a lecturer at Harvard's Psychology Department. The former editor of the Journal of Applied Behavior Analysis and the Journal of the Experimental Analysis of Behavior, he has published more than 100 studies in the field of learning and psychological treatment.