Williams is professor of systematic theology at Covenant Theological Seminary in St. Louis, Missouri. Robert A. Peterson (Ph.D., Drew University) is professor of systematic theology at Covenant Theological Seminary in St. Louis, Missouri. He was formerly professor of New Testament and theology at Biblical Theological Seminary in Hatfield, Pennsylvania. His books include Getting to Know John's Gospel: A Fresh Look at Its Main Ideas, Hell on Trial: The Case for Eternal Punishment, Calvin's Doctrine of the Atonement, Adopted by God: From Wayward Sinners to Cherished Children (all Presbyterian Reformed) and Hell Under Fire (coedited with Chris Morgan, Zondervan). He has written numerous articles, was a contributor to the second edition of the Evangelical Dictionary of Theology (Baker) and edits Covenant Seminary's journal, Presbyterion.