Lori Gruen is associate professor of philosophy at Wesleyan University, where she also chairs the Feminist, Gender, and Sexuality Studies Program and directs the Ethics in Society Project. She has published widely on topics in practical ethics, including animal ethics and mind, feminist ethics and politics, and philosophy of law. She is currently engaged in ongoing collaborations with Laura Grabel addressing biological ethics. Laura Grabel is Fisk Professor of Natural Sciences and professor of biology at Wesleyan University. She has worked with embryonic stem cells for more than twenty years, and her current projects include identifying signals that promote the differentiation of embryonic stem cells and examining conditions that support successful transplantation of these cells in mouse models of human disease. She is an advocate for stem cell research and collaborates with Lori Gruen on topics in biological ethics. Peter Singer is currently the Ira W. DeCamp Professor of Bioethics at Princeton University and Laureate Professor in the Centre for Applied Ethics and Public Policy at the University of Melbourne. He has taught at the University of Oxford, New York University, La Trobe University, and Monash University. His books include Animal Liberation, Practical Ethics, The Reproduction Revolution, Rethinking Life and Death, and, most recently, The Way We Eat.