Millard J. Erickson (PhD, Northwestern University) is distinguished professor of theology at Western Seminary in Portland, Oregon. He is a leading evangelical spokesman and the author of numerous volumes, including the classic text Christian Theology.Paul Kjoss Helseth (PhD, Marquette University) is professor of Christian thought at Northwestern College in St. Paul, Minnesota, and the author of numerous scholarly articles.Justin Taylor (PhD, The Southern Baptist Theological Seminary) is the executive vice president of book publishing and book publisher at Crossway. He has edited and contributed to several books, and he blogs at Between Two Worlds—hosted by the Gospel Coalition.D. A. Carson (PhD, University of Cambridge) is Emeritus Professor of New Testament at Trinity Evangelical Divinity School. He is a cofounder and theologian-at-large of the Gospel Coalition and has written and edited nearly two hundred books. He and his wife, Joy, have two children and live in the north suburbs of Chicago.J. P. Moreland (PhD, University of Southern California) is Distinguished Professor of Philosophy at Biola University. He is an author of, contributor to, or editor of over ninety books, including The Soul: How We Know It's Real and Why It Matters.R. Scott Smith is Assistant Professor of Ethics and Christian Apologetics at Biola University in California. He is the author of Virtue Ethics and Moral Knowledge. Dr. Smith has lectured and presented numerous times on his specialty, postmodernism, and he is also the secretary-treasurer of the Evangelical Philosophical Society.Stephen J. Wellum (PhD, Trinity Evangelical Divinity School) is professor of Christian theology at the Southern Baptist Theological Seminary in Louisville, Kentucky, and editor of The Southern Baptist Journal of Theology. Stephen and his wife, Karen, have five adult children.