Fr. Dennis J. Billy, CSsR, is an American Redemptorist of the Baltimore Province with advanced degrees from Harvard University, The Pontifical University of St. Thomas (Angelicum), and The Graduate Theological Foundation. He taught for more than twenty years at the Alphonsian Academy of Rome's Pontifical Lateran University. He is currently the Karl Rahner Professor of Catholic Theology at the Graduate Theological Foundation. He has authored numerous books and articles on various religious topics.