Marc Bekoff is Professor of Environmental, Population, and Organismic Biology at the University of Colorado, Boulder.

Colin Allen is Professor of Philosophy at Texas A&M University. He is the coauthor of Nature's Purposes (MIT Press, 1998), Species of Mind (MIT Press, 1997), and The Cognitive Animal (MIT Press, 2001).

Gordon Burghardt is Alumni Distinguished Professor in Psychology and in Ecology and Evolutionary Biology at the University of Tennessee. He is a coeditor of The Cognitive Animal (MIT Press, 2002), past president of the Animal Behavior Society, and editor of the Journal of Comparative Psychology.