David VanDrunen (JD, Northwestern University School of Law; PhD Loyola University Chicago) is Robert B. Strimple Professor of Systematic Theology and Christian Ethics at Westminster Seminary California. He is the author of Living in God’s Two Kingdoms: A Biblical Vision for Christianity and Culture and Divine Covenants and Moral Order: A Biblical Theology of Natural Law. Matthew Barrett is associate professor of Christian theology at Midwestern Baptist Theological Seminary, the executive editor of Credo Magazine, and director of The Center for Classical Theology. He is the author of Simply Trinity; None Greater; Canon, Covenant and Christology; and God's Word Alone. He is currently writing a systematic theology.