Dacher Keltner is Professor of Psychology and the Director of the Greater Good Science Center at the University of California, Berkeley. He has taught social psychology for the past 18 years and is the recipient of the Distinguished Teaching Award for Letters and Sciences. His research focuses on the prosocial emotions (such as love, sympathy, and gratitude), morality, and power. Other awards include the Western Psychological Associationrs"s award for outstanding contribution to research, the Positive Psychology Prize for excellence in research, and the Distinguished Mentoring Award at UC Berkeley. He is a fellow of the American Psychological Association, the American Psychological Society, and the Society for Personality and Social Psychology. In 2008, the Utne Reader listed Dacher as one of the 50 visionaries changing the world.