Carol Sansone, Ph.D. (1984, Columbia University) is Professor of Psychology at the University of Utah. Her research examines the process through which people regulate their interest and motivation in day-to-day life, using social and non-social means. She is interested in how this process might differ as a function of person characteristics (such as gender) and across the life span, and in the applications of this work to selection of and persistence in math and science careers and to online learning. She is a Fellow of the Society of Personality and Social Psychology, and has served on the editorial boards of a number of journals in social psychology and personality (e.g., Journal of Personality and Social Psychology, Journal of Experimental Social Psychology), and as a consultant for several granting agencies. She previously edited a special issue of the Journal of Experimental Social Psychology on "New Directions in Intrinsic Motivation and Creativity" (1999), and a book (with J.M. Harackiewicz as co-editor) published by Academic Press entitled, "Intrinsic and Extrinsic Motivation: The Search for Optimal Motivation and Performance" (2000). Other recent publications have appeared in the journals Developmental Psychology, Journal of Experimental Social Psychology, Journal of Personality, Psychological Inquiry, and Sex Roles. Michael Hogg is Professor of Social Psychology at Claremont Graduate University. He is also an Honorary Professor of Psychology at the University of Kent and the University of Queensland. His research focuses on social identity processes within and between large and small groups, and he has published widely on topics including intergroup relations, group cohesion, leadership, group motivations, and conformity processes. Professor Hogg is co-editor of the journal Group Processes and Intergroup Relations, an associate editor of the Journal of Experimental Social Psychology, and Senior Consulting Editor for the SAGE Social Psychology Program. He is a fellow of the Society for Personality and Social Psychology, the Society for the Psychological Study of Social Issues, the Western Psychological Association, and the Academy of the Social Sciences in Australia. Michael Hogg' home page: Joel Cooper received his B.A. from the City College of New York in 1965 and a Ph.D. from Duke University in 1969. He joined the psychology department faculty at Princeton University in 1969, attaining the rank of full professor in 1978. Professor Cooper's major research focus is on attitudes and attitude change, particularly as they relate to the process of cognitive dissonance. His recent work examines vicarious experiences of dissonance (i.e., feeling dissonance due to the inconsistent behavior of others) and the role of the self in dissonance arousal. Two other areas of active interest are (1) the effect of expert testimony in courts of law, and (2) gender differences in the effectiveness of information technology, particularly among school children. Stephen Sutton is Professor of Behavioural Science in the Institute of Public Health, University of Cambridge, and Director of Research and Head of the Behavioural Science Group in the General Practice & Primary Care Research Unit. He is also Visiting Professor of Psychology at the University of Bergen, Norway, and Visiting Professor of Social/Health Psychology at University College London. He studied social psychology at the London School of Economics and computer science at City University. He received his PhD from the University of London in 1981 for research on the effects of fear appeals. Before moving to Cambridge in 2001, he held posts at the Institute of Psychiatry and University College London. His research programme focuses on the development and evaluation of theory-based behaviour change interventions for smoking cessation, physical activity and medication adherence, using both face-to-face and 'distance' approaches such as electronic monitoring and feedback and tailored text messaging.