Charles E. Schaefer, PhD, RPT-S, until his death in 2020, was Professor Emeritus of Clinical Psychology at Fairleigh Dickinson University. A pioneering play therapist, he was Cofounder and Director Emeritus of the Association for Play Therapy, which recognized him with its Lifetime Achievement Award. Dr. Schaefer published more than 100 research articles and over 70 professional books, including Prescriptive Play Therapy; Play-Based Interventions for Childhood Anxieties, Fears, and Phobias; and Essential Play Therapy Techniques.

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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 codirector of the Play Therapy Training Institute. She has lectured internationally on play therapy, attention-deficit/hyperactivity disorder, and learning disabilities. Dr. Kaduson's publications include The Playing Cure and 101 Favorite Play Therapy Techniques (Volumes I, II, and III). With Charles E. Schaefer, she is coeditor of Short-Term Play Therapy for Children, Second Edition. Dr. Kaduson maintains a private practice in child psychotherapy in Monroe Township, New Jersey.

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