J. Todd Billings is Associate Professor of Reformed Theology at Western Theological Seminary in Holland, Michigan, and the author of numerous publications including Union with Christ: Reframing Theology and Ministry for the Church and Calvin, Participation, and the Gift, for which he won a 2009 Templeton Award for Theological Promise.I. John Hesselink is Albertus C. Van Rallte Professor Emeritus of Systematic Theology at Western Theological Seminary in Holland, Michigan, and the author of numerous publications including Calvin's Conception of the Law and Calvin's First Catechism: A Commentary.