Peter Singer is Ira W. DeCamp Professor of Bioethics at the University Center for Human Values, Princeton University. He is the author of "Animal Liberation," first published in 1975, and is widely credited with triggering the modern animal rights movement. His "Practical Ethics" is one of the most widely used texts in applied ethics, and "Rethinking Life and Death" received the 1995 Australian National Book Council's Banjo Award for non-fiction. He is the editor of "A Companion to Ethics" (Blackwell 1991) and was the foundation president of the International Association of Bioethics.

Helga Kuhse is an Honorary Senior Research Fellow at Monash University and Senior Visiting Fellow at the University of Melbourne. She is the author of "Caring" (Blackwell 1997); "Willing to Listen - Wanting to Die" (1995); "Individuals, Humans, and Persons" (with Peter Singer, 1994); "The Sanctity-of-Life Doctrine in Medicine "(1987); and "Should the Baby Live? "(with Peter Singer, 1985). She is also co-editor, with Peter Singer, of "A Companion to Bioethics" and "Bioethics: An Anthology," both published by Blackwell.