Robertson McQuilkin is a speaker and writer, engaging in extensive conference ministry in the United States and overseas. He served as the third president of Columbia International University for 22 years, and is now president emeritus. Before becoming president, McQuilkin was headmaster of Ben Lippen School and a missionary in Japan. A few of his other books include Five Smooth Stones (Broadman), Life in the Spirit (LifeWay) and Introdution to Biblical Ethics (Tyndale).
Paul Copan is Professor and the Pledger Family Chair of Philosophy and Ethics at Palm Beach Atlantic University, FL, USA. He is the co-editor (with Paul Moser) of The Rationality of Theism (Routledge), (with Chad Meister) of The Routledge Companion to Philosophy of Religion (Routledge), and Philosophy of Religion: Classic and Contemporary Issues (Blackwell), and co-author (with William Craig) of Creation Out of Nothing: A Biblical, Philosophical, and Scientific Exploration (Baker Academic).