Op-Ed Expanding the Circle Peter Singer From: Volume 26, No. 5 August / September 2006 ShareTweet Peter Singer Peter Singer is DeCamp Professor of Bioethics at the University Center for Human Values at Princeton University. His books include Animal Liberation, How Are We to Live?, Writings on an Ethical Life, One World, and, most recently, Pushing Time Away. See more articles This article is available to subscribers only. Subscribe now or log in to read this article.