Dennis Greenberger, PhD, a clinical psychologist, is founder and Director of the Anxiety and Depression Center in Newport Beach, California. He is a past president and Founding Fellow of the Academy of Cognitive Therapy (now the Academy of Cognitive and Behavior Therapies). Dr. Greenberger trained at the University of Pennsylvania's Center for Cognitive Therapy and was mentored by Aaron T. Beck and Judith S. Beck. He is a longtime practitioner of CBT and has presented at national and international conferences. Dr. Greenberger is coauthor of the bestselling self-help resource Mind Over Mood, Second Edition, which was cited as the most influential CBT book of all time by the British Association for Behavioural and Cognitive Psychotherapies. His website is www.anxietyanddepressioncenter.com.