Peter Singer has published over 30 books including Writings on an Ethical Life, Animal Liberation, and most recently, The President of Good and Evil. Singer is currently the Ira W. DeCamp Professor of Bioethics at Princeton University's Center for Human Values. He lives in New York City. Jim Mason is an author, speaker, journalist, environmentalist and attorney. He is the author of many books including Animal Factories, co-written with Peter Singer. His writing has appeared in a variety of publications including the New York Times, the New Scientist and Audubon.