Walter J. Matweychuk, PhD, Licensed Psychologist

Dr. Walter J. Matweychuk was certified as a Fellow in rational emotive behavior therapy and became a Certified REBT Supervisor in 1989. He is a practicing psychologist in the Department of Psychiatry at the University of Pennsylvania Health System, Perelman School of Medicine. Dr. Matweychuk has extensive experience training and supervising psychotherapists both at the University of Pennsylvania and independently. In addition, he maintains a global independent telehealth practice. He is an adjunct professor of Applied Psychology at New York University, where he taught a graduate course on cognitive behavior therapy and applications from 2015 to 2025. Dr. Matweychuk's professional background is distinguished by his direct training under the two founders of cognitive behavior therapy, Aaron T. Beck and Albert Ellis. He also served as a senior research associate at the Aaron T. Beck Center for Psychopathology from 2007 to 2014. Dr. Matweychuk has written and lectured extensively on the similarities and distinctions between these foundational approaches to cognitive behavior therapy. From 2018 to 2019, Dr. Matweychuk served as a subject matter expert consultant for the United States Navy. He contributed to the development of a concise, evidence-informed classroom program designed to enhance mental fitness and psychological endurance among Navy recruits and enlisted Sailors. This program equipped service members with skills to address disruptive thoughts, emotions, and behaviors. The Defense Suicide Prevention Office sponsored this initiative. Dr. Matweychuk is the co-author of Overcoming Your Addictions (2000) with Dr. Windy Dryden. He has also written Rational Emotive Behavior Therapy: A Newcomer's Guide (2017) for a professional audience, and the therapy companion REBT Pocket Companion Guide for Clients, 2nd edition (2022) with Dr. Dryden. In addition, he has published numerous professional articles and book chapters on REBT. For over 300 consecutive Saturdays, starting from August 8th, 2020, Dr. Matweychuk has hosted weekly educational demonstrations on Zoom of REBT with volunteer participants for a global audience. He also publishes a widely read biweekly educational newsletter on REBT, aptly titled Intermittent Reinforcement.