Douglas Groothuis (PhD, University of Oregon) is professor of philosophy at Denver Seminary. He is the author of numerous books, including Christian Apologetics, Fire in the Streets, Philosophy in Seven Sentences, Truth Decay, and Walking Through Twilight. He has written for scholarly journals including Religious Studies, Sophia, Research in Philosophy and Technology, Journal of the Evangelical Theological Society, and Philosophia Christi, as well as for numerous popular magazines.