Ervin Staub has taught at Harvard and the University of Massachusetts at Amherst, among other institutions. He looked at the factors that lead to caring, helping, and altruism in adults and children, the roots of genocide and other forms of mass violence, group violence prevention, and post-violence reconciliation. He wrote a lot about these subjects. He's also worked in a variety of real-world situations on projects ranging from reconciliation and the prevention of new violence in Rwanda, Burundi, and the Congo to minimizing police use of excessive force and developing compassionate schools.