Robb Willer, Ph.D., is a professor of sociology, psychology (by courtesy), and organizational behavior (by courtesy) at Stanford University. He received a Ph.D. and M.A. in Sociology from Cornell University and a B.A. in Sociology from the University of Iowa. He studies social forces that bring people together (e.g., morality, altruism), forces that divide them (e.g., fear, prejudice), and domains of social life that feature the complex interplay of the two (e.g., hierarchies, politics).