de WaalFrans B. M.: Frans B. M. de Waal is C. H. Candler Professor of Primate Behavior in the Psychology Department and Director of Living Links, part of the Yerkes Primate Center, Emory University.TyackPeter L.: Peter L. Tyack is Senior Scientist, Woods Hole Oceanographic Institution.McGrewW.C.: William McGrew is Professor of Anthropology and Zoology at Miami University (Ohio).PerrySusan: ?Susan Perry is Associate Professor of Anthropology at the University of California, Los Angeles.van SchaikCarel: Carel van Schaik is Professor and Director of the Anthropological Institute and Museum, University of Zurich.