Heidi Gerard Kaduson, PhD, RPT-S, specializes in evaluation and intervention services for children with a variety of behavioral, emotional, and learning problems. She is past president of the Association for Play Therapy and co-director of the Play Therapy Training Institute. Kaduson has co-edited many books and maintains a private practice in Monroe Township, New Jersey. Charles E. Schaefer, PhD, RPT-S, is professor emeritus of psychology, Fairleigh Dickinson University, Hackensack, New Jersey. Schaefer is cofounder and director emeritus of the Association for Play Therapy and a fellow of the American Psychological Association. Among Schaefer's sixty-five books are the outstanding Handbook of Play Therapy and The Therapeutic Use of Child's Play, both of which have become classics in the field. He maintains a private psychotherapy practice for children and their families in Hackensack, New Jersey.