Matthew Levering is the James N. and Mary D. Perry Jr. Chair of Theology, Mundelein Seminary, and author and editor of numerous books, including The Achievement of Hans Urs von Balthasar: An Introduction to His Trilogy, An Introduction to Vatican II as an Ongoing Theological Event and Paul in the Summa Theologiae (all CUA Press). Bruce McCormack is Charles Hodge Professor of Systematic Theology, Princeton Theological Seminary. Thomas Joseph White, OP is Director, Thomistic Institute, Angelicum, Rome, and author of The Light of Christ: An Introduction to Catholicism and The Incarnate Lord: A Thomistic Study in Christology (both CUA Press).