Dacher Keltner is a social psychologist who focuses on the prosocial emotions, such as love, sympathy and gratitude, and processes such as teasing and flirtation that enhance bonds. He has conducted empirical studies in three areas of inquiry. A first looks at the determinant and effects of power, hierarchy and social class. A second in concerned with the morality of everyday life, and how we negotiate moral truths in teasing, gossip, and other reputational matters. A third and primary focus in on the biological and evolutionary basis of the benevolent affects, including compassion, awe, love, gratitude, and laughter and modesty. Professor Keltner is Co-Director of The Greater Good Science Center and the author of Born to Be Good.