"Social Justice, Voluntarism, and Liberal Nationalism" Journal of Moral Philosophy, v. 2 (November, 2005).
"Global Justice and Health: Is Health Care a Basic Right?," in Public Health Ethics, ed. M. Boylan (Dordrecht: Kluwer, 2004).
"Justice and Law in Hobbes," Oxford Studies in Early Modern Philosophy v. 1 (Oxford: Oxford University Press, 2003).
"Institutional Responsibility for Global Problems," Philosophical Topics 30 no. 2 (Fall 2002). Reprinted as "Institutional Responsibility for Moral Problems," in Global Responsibilities: Securing Rights by Defining Obligations, A. Kuper ed. (Routledge, 2005).
"The Idea of a Momentary Self and Hume's Theory of Personal Identity," British Journal for the History of Philosophy 7 (1999): 103-122.