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John Langan, SJ, is the Cardinal Bernardin Chair in Catholic Social Thought in the Department of Philosophy at Georgetown University. His research interests include ethics and international affairs, especially applications of just war theory; human rights in theory and practice; capital punishment; Catholic social teaching; the place of religion in liberal political thought; and the ethical theories of St. Thomas Aquinas and St. Augustine. He has edited Catholic Universities in Church and Society (1993) and A Moral Vision for America (1998). Langan holds an AB, MA, and PhL from Loyola University, as well as a BD from Woodstock College and PhD from the University of Michigan.