William Barbieri is associate professor of ethics in the School of Theology and Religious Studies and director of the Peace and Justice Studies Program at the Catholic University of America, where he is also a fellow at the Institute for Policy Research and Catholic Studies and the Center for the Study of Culture and Values. Barbieri was previously a visiting researcher at the Berkley Center. His research and teaching focuses on the intersections of ethics, religion, and political theory, including the theory of justice and the historicity of morals. His publications include At the Limits of the Secular: Reflections on Faith and Public Life (2014), Ethics of Citizenship: Immigration and Group Rights in Germany (1998) and numerous journal articles. Barbieri is also coeditor of From Just War to Modern Peace Ethics (2012). He received his doctorate in religious ethics from Yale University.