Daniel S. Sweeney, PhD, is a professor of counseling and director of the Northwest Center for Play Therapy Studies at George Fox University in Portland, Oregon. He is a past board member and president of the Association for Play Therapy. Dr. Sweeney maintains a small private practice and is an international presenter. He has authored or co-authored several books, including Play Therapy Interventions with Children's Problems, Counseling Children Through the World of Play, Sandtray Therapy: A Practical Manual, and The Handbook of Group Play Therapy. His books have been translated into Chinese, Korean, and Russian. Jennifer N. Baggerly, PhD, is a professor and the chair of the division of counseling and human services at the University of North Texas at Dallas and has served as chair of the board of directors of the Association for Play Therapy (APT). She has taught and provided group play therapy for over ten years in schools and community agencies. Dr. Baggerly’s multiple research projects and over fifty publications have led to her being recognized as a prominent play therapy expert. Dee C. Ray, PhD, is a professor in the counseling program and director of the Child and Family Resource Clinic at the University of North Texas. Dr. Ray has published over seventy-five articles, chapters, and books in the field of play therapy, and over twenty research publications specifically examining the effects of child-centered play therapy. Dr. Ray is the author of Advanced Play Therapy, co-editor of Child Centered Play Therapy Research, and former editor of the International Journal of Play Therapy.