Carl R. Trueman (PhD, University of Aberdeen) is the Paul Woolley Professor of Church History at Westminster Theological Seminary and pastor of Cornerstone Presbyterian Church (OPC) in Ambler, Pennsylvania. He was editor of Themelios for nine years, has authored or edited more than a dozen books, and has contributed to multiple publications including the Dictionary of Historical Theology and The Cambridge Companion to Reformation Theology. Stephen J. Nichols (PhD, Westminster Theological Seminary) serves as the president of Reformation Bible College and chief academic officer of Ligonier Ministries. He is an editor of the Theologians on the Christian Life series and also hosts the weekly podcast 5 Minutes in Church History. Justin Taylor (PhD, The Southern Baptist Theological Seminary) is the executive vice president of book publishing and book publisher at Crossway. He has edited and contributed to several books including A God-Entranced Vision of All Things and Reclaiming the Center, and he blogs at Between Two Worlds-hosted by the Gospel Coalition.