The Anxiety and Worry Workbook

David A. Clark, PhD, is a clinical psychologist, and professor emeritus at the University of New Brunswick in Canada. He is author of several books on depression and anxiety, including Overcoming Obsessive Thoughts, The Anxiety and Worry Workbook, The Anxious Thoughts Workbook, The Negative Thoughts Workbook, and his most recent publication, This Is What Anxiety Looks Like. He has coauthored several books with the pioneer of cognitive behavioral therapy (CBT), Aaron T. Beck, including Cognitive Therapy for Anxiety Disorders.

Aaron T. Beck, M.D., widely known as the father of cognitive therapy, was University Professor Emeritus at the University of Pennsylvania School of Medicine and president of the Beck Institute for Cognitive Therapy and Research. He graduated magna cum laude and Phi Beta Kappa from Brown University, and went on to attend Yale Medical School. He received more than 18 major professional awards from associations such as the National Institute of Mental Health, the American Psychiatric Association, the American Psychological Association, and the American Psychopathological Association.