Michelle Heffner, MA, was trained in the West Virginia University Department of Behavioral Medicine and Psychiatry eating disorders program. She has assessed and treated eating disorder clients in the West Virginia University Department of Psychology clinic and the West Virginia University Carruth Center for Counseling and Psychological Services. Georg H. Eifert, Ph.D., is professor and chair of the department of psychology at Chapman University in Orange, CA. He was ranked among the top thirty researchers in behavior analysis and therapy in the 1990s, and he has authored over 100 publications on psychological causes and treatments of anxiety and other emotional disorders. He is a clinical fellow of the Behavior Therapy and Research Society, a member of numerous national and international psychological associations, and he serves on several editorial boards of leading clinical psychology journals. He is also a licensed clinical psychologist. He is coauthor of Acceptance and Commitment Therapy for Anxiety Disorders and ACT on Life, Not on Anger.