Robert Kolb (PhD, University of Wisconsin) is Mission Professor of Systematic Theology Emeritus at Concordia Seminary in St. Louis, Missouri, and is the author of many books. Carl R. Trueman (PhD, University of Aberdeen) is professor of biblical and religious studies at Grove City College in Grove City, Pennsylvania, and is the author of numerous books. He previously served as Paul Woolley Professor of Church History at Westminster Theological Seminary in Philadelphia and as a visiting fellow at Princeton University.