Mark A. McIntosh is Professor of Systematic Theology and Spirituality at Loyola University, Chicago, where he has taught undergraduates and doctoral students for fifteen years. His publications include Christology from Within: Spirituality and the Incarnation in Hans Urs von Balthasar (1996), Mystical Theology: The Integrity of Spirituality and Theology (Blackwell, 1998), Mysteries of Faith (2000), and Discernment and Truth (2004). A priest in the Episcopal Church, he has served as canon theologian to the Presiding Bishop and Primate.