Matthew McKay, PhD, is professor at the Wright Institute in Berkeley, CA. In private practice, he specializes in the treatment of anxiety, interpersonal problems, and depression. He is coauthor of The Relaxation and Stress Reduction Workbook, Thoughts and Feelings, Self-Esteem, Your Life on Purpose, and many other titles. Combined, his books have sold more than three million copies. Avigail Lev, PsyD, is clinical supervisor at the Berkeley Cognitive and Behavioral Therapies Clinic. She specializes in couples therapy and treating mood disorders and interpersonal problems. Michelle Skeen, PsyD, studied schema therapy under Jeffrey Young. She completed her postdoctoral work at the University of California, San Francisco, and maintains a private practice in San Francisco, CA, where she lives and works. She hosts a radio show and is author of The Critical Partner. www.michelleskeen.com Foreword writer Steven C. Hayes, PhD, is University of Nevada Foundation Professor of Psychology at the University of Nevada, Reno. He is author of hundreds of scientific articles and many books, including Acceptance and Commitment Therapy, Relational Frame Theory, and Get Out of Your Mind and Into Your Life.