Stefan G. Hofmann, PhD, is a professor in Boston University's department of psychological and brain sciences clinical program, where he directs the Psychotherapy and Emotion Research Laboratory (PERL). His research focuses on the mechanism of treatment change-translating discoveries from neuroscience into clinical applications, emotions, and cultural expressions of psychopathology. He is past president of the Association for Behavioral and Cognitive Therapies (ABCT), and the International Association for Cognitive Psychotherapy (IACP). He is also editor in chief of Cognitive Therapy and Research, and associate editor of Clinical Psychological Science. He has authored numerous books, including An Introduction to Modern CBT and Emotion in Therapy.Judith S. Beck, PhD, is director of the Beck Institute for Cognitive Behavior Therapy, clinical associate professor of psychology in psychiatry at the University of Pennsylvania, and past president of the Academy of Cognitive Therapy. Daughter of influential founder of cognitive therapy, Aaron T. Beck, Beck resides in Bala Cynwyd, PA. She is author of The Beck Diet Solution.