Leon R. Kass, M.D., Ph.D., is the Addie Clark Harding Professor in the Committee on Social Thought and the College at the University of Chicago. In his teaching and his scholarship, Dr. Kass draws on classical texts of philosophy, religion, science, and literature to address questions of human nature and human good, with special attention to the ethical challenges raised by advances in the life sciences. Dr. Kass has received several honors both for his work on science and human affairs and for his teaching, most recently an honorary Doctorate of Humane Letters from the University of Dallas in 1997. He is a Founding Fellow of the Hastings Center in Garrison, NY; Senior Fellow of the MacLean Center for Clinical Medical Ethics at the University of Chicago; and project codirector and coeditor of a series of anthologies on the Ethics of Everyday Life (University of Notre Dame Press, 2000), produced by the Institute of Religion and Public Life. Dr. Kass has written numerous articles and books, including The Ethics of Human Cloning, with coauthor James Q. Wilson, (Washington: AEI Press, 1998); The Hungry Soul: Eating and the Perfecting of Our Nature, 2nd edition (Chicago: University of Chicago Press, 1999); Toward a More Natural Science Biology and Human Affairs (New York: Free Press, 1988.); and Wing to Wing, Oar to Oar: Readings on Courting and Marrying, with coauthor Amy A. Kass (South Bend: University of Notre Dame Press, 2000). His first essay on immortality research, “The Case for Mortality,” was published in The American Scholar in 1983. Dr. Kass is completing a book on Genesis, read in a wisdom-seeking spirit and as part of his ongoing inquiry into the relation between human nature and human good.