Walter A. Elwell (PhD, University of Edinburgh) is professor emeritus of New Testament at Wheaton College and Graduate School in Wheaton, Illinois, where he taught for twenty-seven years and served as dean. He has written or edited numerous books, reference works, and articles. Robert W. Yarbrough (PhD, University of Aberdeen) is professor of New Testament at Covenant Theological Seminary in St. Louis, Missouri. He lectures internationally and is the author, editor, or translator of numerous books, articles, and reviews.