Susan M. Knell, Ph.D. is a clinical psychologist and adjunct assistant professor in the department of Psychological Sciences at Case Western Reserve University. She received her undergraduate degree Magna Cum Laude from Mount Holyoke College, and graduate degrees from the Ohio State University (M.A., Developmental Psychology) and Case Western Reserve University (Ph.D., Clinical Psychology). She did pre- and post-doctoral training at the Neuropsychiatric Institute, UCLA. At Case Western Reserve, she teaches and supervises doctoral students. In addition to research, training and teaching positions, Dr. Knell has maintained a private practice for over 40 years, where she has provided assessment and therapeutic services to children, adolescents, and adults. She authored the book Cognitive Behavioral Play Therapy (1993) which has been translated and published in Italian (1998) and Turkish (2021). Dr. Knell is known for her groundbreaking work integrating Cognitive Behavior Therapy with Play Therapy as a developmentally sensitive approach to psychotherapy with young children. She has written numerous chapters on CBPT in edited books, lectured throughout the United States and internationally, and served as a manuscript reviewer for peer reviewed journals. She co-founded the CBPT Institute in Rome, Italy.