Heidi Gerard Kaduson, PhD, RPT-S, specializes in evaluation and intervention services for children with a variety of behavioral, emotional, and learning problems. She has edited and authored many books on play therapy, including Prescriptive Play Therapy: Tailoring Interventions to Specific Childhood Problems; Contemporary Play Therapy; Short-Term Play Therapy for Children, 3d edition; 101 Favorite Play Therapy Techniques; and 101 More Favorite Play Therapy Techniques. She is past president of the Association for Play Therapy and director of The Play Therapy Training Institute in Monroe Township, New Jersey. She maintains a private practice in child psychotherapy in Monroe Township.

Charles E. Schaefer, PhD, is an emeritus professor of psychology and former director of the Center for Psychological Services at Fairleigh Dickinson University. He is the cofounder and board member emeritus of the International Association for Play Therapy and is the founder of the Play Therapy Training Institute in New Jersey. With more than 40 years of experience working with children and parents, Dr. Schaefer has received numerous awards for his clinical and research work on child development, parenting, and play therapy; has published more than 60 books and numerous articles and book chapters on play-based interventions; and serves on several journal editorial review boards. His recent books include The Therapeutic Powers of Play (2nd ed.), Foundations of Play Therapy (2nd ed.), Empirically Based Play Interventions for Children (2nd ed.), and Play Therapy for Preschool Children. He is the former director of psychology at The Children's Village in Dobbs Ferry, New York. He maintains a private practice for children and their families in Hackensack, New Jersey.