Jerry Suls is Professor of Psychology at the University of Iowa. He has published more than 130 articles and chapters on social psychology and health psychology and is the author or editor of numerous books, including Psychological Perspectives on Self and Identity (edited with Abraham Tesser and Richard B. Felson, 2000) and Handbook of Social Comparison (edited with Ladd Wheeler, 2000). Kenneth A. Wallston is Professor of Psychology in Nursing at Vanderbilt University. He has published extensively on perceived control and health as well as on adaptation to rheumatoid arthritis. He is a member of the Executive Committee of the Society of Behavioral Medicine and has been the editor of the newsletter The Health Psychologist since 1993.