DAVID MAPEL (M.Sc., London School of Economics, 1978, M.A. and Ph.D., Johns Hopkins University, 1983). Research and teaching interests: political theory and international relations. Specializations: contemporary Anglo-American political philosophy; theories of social justice; political obligation and authority; international ethics; Hobbes. His publications include: Social Justice Reconsidered (Illinois, 1989), "Contingency and the Idea of Civil Association," Political Theory, 1990; "Voluntarism and Democratic Theory", Polity, 1990; "Practical Judgment and the Plurality of Value in International Relations," The Journal of Politics, 1990; "Contractarianism in International Ethics" and "Convergence and Divergence," both in Traditions of International Ethics, co-edited with Terry Nardin (Cambridge University Press, 1991), "Realism and the Ethics of War and Peace," in The Ethics of War and Peace: Diverse Religions and Secular Perspectives, edited by Terry Nardin (Princeton University Press, 1996); "Justice, Diversity and Law" in The Constitution of International Society, co-edited with Terry Nardin.