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. Donna Cangelosi, PsyD, RPT-S, maintains a private practice with children, adolescents, and adults in Wayne, New Jersey, where she practices psychotherapy, clinical supervision, and parent education. She is coeditor of Play Therapy Techniques and The Playing Cure and author of Saying Goodbye in Child Psychotherapy. Dr. Cangelosi has authored a number of professional articles and chapters on the theory and application of psychodynamic play therapy.