He received his Ph.D. from Princeton in 1980. His research interests center on contemporary metaethics and normative ethics, especially consequentialism. He is the author of the book Facts, Norms, and Values and a co-editor (with Stephen Darwall and Allan Gibbard) of Moral Discourse and Practice. He has also written several seminal papers on scientific explanation.
He has been a visiting professor at the University of California, Berkeley, and Princeton University, and is a distinguished professor at the University of Michigan.
1984, "Alienation, Consequentialism, and the Demands of Morality," Philosophy and Public Affairs, Vol. 13, No. 2, pp. 134–171.
1986, "Moral Realism," The Philosophical Review, Vol. 95, No. 2, pp. 163–207.
1991, "Moral Theory As A Moral Practice," Noûs, Vol. 25, No. 2, pp. 185–190.
1992, "Some Questions About the Justification of Morality," Philosophical Perspectives, Vol. 6, pp. 27–53.
1992, "Pluralism, Determinacy, and Dilemma," Ethics, Vol. 102, No. 4, pp. 720–742.
1993, "Noncognitivism about Rationality: Benefits, Costs, and an Alternative," Philosophical Issues, Vol. 4, pp. 36–51.
1994, "Truth, Reason, and the Regulation of Belief," Philosophical Issues, Vol. 5, pp. 71–93.
1996, "Moral Realism: Prospects and Problems," in Sinnott-Armstrong and Timmons (eds.), Moral Knowledge?, Oxford University Press.
1996, Moral Discourse and Practice (co-edited with Stephen Darwall and Allan Gibbard), Oxford University Press.
2003, Facts, Values, and Norms, Cambridge University Press.