Kolb, Robert: - Robert Kolb (PhD, University of Wisconsin) is Mission Professor of Systematic Theology Emeritus at Concordia Seminary in St. Louis, Missouri. He is the author or coauthor of numerous books, including The Genius of Luther's Theology, Luther and the Stories of God, Martin Luther: Confessor of the Faith, and The Christian Faith: A Lutheran Exposition. Kolb is also coeditor of The Book of Concord (2000 translation). He has lectured at more than forty educational institutions on five continents and at many ecclesiastical gatherings. Since 1996 he has been Gastdozent at the Lutherische Theologische Hochschule in Oberursel, Germany.

Trueman, Carl R.: - Carl R. Trueman (PhD, University of Aberdeen) is professor of biblical and religious studies at Grove City College in Grove City, Pennsylvania. He previously served as Paul Woolley Professor of Church History at Westminster Theological Seminary in Philadelphia and as a visiting fellow at Princeton University. He has written more than a dozen books, including Grace Alone--Salvation as a Gift of God, The Creedal Imperative, and Luther's Legacy: Salvation and the English Reformers, 1525-1556. He also writes online regularly at firstthings.com.