Frans de Waal received his PhD in zoology and ethology from Utrecht University, the Netherlands, in 1977, and then completed a postdoctoral study of chimpanzees while associated with that university. In 1981 he moved to the United States, where he now lives. De Waal is C. H. Candler Professor at the Department of Psychology and director of the Living Links Center for the Advanced Study of Ape and Human Evolution at the Yerkes National Primate Research Center, both at Emory University in Atlanta, Georgia. His previous books include Chimpanzee Politics: Power and Sex among Apes ( Jonathan Cape, 1982), Bonobo: The Forgotten Ape (University of California Press, 1997), Our Inner Ape (Riverhead Books, 2005), and The Age of Empathy: Nature’s Lessons for a Kinder Society (Harmony Books, 2009).