William Barbieri is associate professor in the School of Theology and Religious Studies at Catholic University (CUA) and was previously a visiting researcher at the Berkley Center. At CUA he also directs the Peace and Justice Studies Program and is a fellow at the Institute for Policy Research and Catholic Studies. He received his doctorate in religious ethics from Yale University (1992), and teaches and writes on topics emerging from the intersections of ethics, religion, and political theory. His publications include Ethics of Citizenship: Immigration and Group Rights in Germany (Duke, 1998) and numerous journal articles. Barbieri is also coeditor of From Just War to Modern Peace Ethics (DeGruyter, 2012). He is currently working on two books: Constitutive Justice, an examination of the problem of how to develop and defend just criteria for inclusion in—and exclusion from—political communities, and At the Limits of the Secular: Reflections on Faith and Public Life. He is also coordinating a research team looking at Catholic teaching and the historicity of morality.