Marc Bekoff has published thirty books, including The Emotional Lives of Animals. He is professor emeritus of ecology and evolutionary biology at the University of Colorado, Boulder, and a former Guggenheim fellow. He lives in Boulder, Colorado.

Jessica Pierce, author of Run, Spot, Run: The Ethics of Keeping Pets, is faculty affiliate at the University of Colorado Center for Bioethics and Humanities. She lives in Lyons, Colorado, with her husband, daughter, two dogs, and a cat.