Robert M. Seyfarth is professor of psychology and Dorothy L. Cheney is professor of biology at the University of Pennsylvania. They are the coauthors of How Monkeys See the World: Inside the Mind of Another Species and Baboon Metaphysics: The Evolution of a Social Mind. Michael L. Platt is the James S. Riepe University Professor of neuroscience, psychology, and marketing at the University of Pennsylvania.
