Addie Clark Harding Professor Emeritus of Social Thought and in the College
Toward a More Natural Science: Biology and Human Affairs (1985).
The Hungry Soul: Eating and the Perfecting of Our Nature (1994; 2nd ed. 1999).
The Ethics of Human Cloning, with James Q. Wilson (1998).
Wing to Wing, Oar to Oar: Readings on Courting and Marrying, ed. with Amy A. Kass (2000).
Life, Liberty, and the Defense of Dignity: The Challenge for Bioethics (2002).
The Beginning of Wisdom: Reading Genesis (2003).