Dacher Keltner, PhD, is a Professor of Psychology at the University of California, Berkeley, and the faculty director of the Greater Good Science Center. His research focuses on the biological and evolutionary origins of emotion—in particular, prosocial states, such as compassion, awe, love, and beauty—as well as power, social class, and inequality. Along with several books, Dr. Keltner has published more than 200 scientific articles written for many media outlets and has consulted for the Center for Constitutional Rights (to help end solitary confinement), Google, Facebook, the Sierra Club, and Pixar’s Inside Out.