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David A. Clark, PhD, is Professor of Psychology at the University of New Brunswick, Canada, where he also has had a private practice for 25 years. Dr. Clark is a widely recognized authority on cognitive behavior therapy for anxiety and depression and is the author of numerous books, including The Anxiety and Worry Workbook (with Aaron T. Beck) and Overcoming Obsessive Thoughts. He is a Founding Fellow of the Academy of Cognitive Therapy and a Fellow of the Canadian Psychological Association.