Michael Lewis, PhD, is University Distinguished Professor of Pediatrics and Psychiatry and Director of the Institute for the Study of Child Development at Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey. Dr. Lewis has written or edited more than 30 books on developmental psychology, and he was rated as number one in scholarly impact in the field of developmental psychology in a survey published in Developmental Review.ÿJeannette M. Haviland-Jones, PhD, is Professor of Psychology and Director of the Human Emotions Lab at Rutgers, The State University of New Jersey. She has written extensively about emotional development for over 25 years. Her long-time research interests have included lifespan changes in displays of emotion, gender differences in emotions, and the organizing effects of emotion on cognition and on personality. Recently she has initiated research on the chemosensory aspects of emotion communication, including studies on the emotional environment.ÿLisa Feldman Barrett, PhD, is Distinguished Professor of Psychology and Director of the Interdisciplinary Affective Science Laboratory at Northeastern University, with research appointments at Harvard Medical School and Massachusetts General Hospital. Her major research focus is on the nature of emotion from social-psychological, psychophysiological, cognitive science, and neuroscience perspectives. Dr. Barrett has published over 120 papers, book chapters, and books. A recipient of prestigious research awards, she is currently Co- Editor in Chief of Emotion Review.