John Piper is founder and lead teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. He served for thirty-three years as the pastor of Bethlehem Baptist Church in Minneapolis, Minnesota, and is the author of more than fifty books, including Desiring God; Don't Waste Your Life; and Reading the Bible Supernaturally.

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, including A God-Entranced Vision of All Things and Reclaiming the Center, and he blogs at Between Two Worlds--hosted by the Gospel Coalition.

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.

Wayne Grudem (PhD, University of Cambridge; DD, Westminster Theological Seminary) is Distinguished Research Professor of Theology and Biblical Studies at Phoenix Seminary, having previously taught for twenty years at Trinity Evangelical Divinity School. He is a former president of the Evangelical Theological Society, a member of the Translation Oversight Committee for the English Standard Version of the Bible, the general editor of the ESV Study Bible, and the author of over twenty-five books.

Mark Talbot (PhD, University of Pennsylvania) is associate professor of philosophy at Wheaton College. His areas of expertise include philosophical psychology, philosophical theology, David Hume, Augustine, and Jonathan Edwards. He and his wife, Cindy, have one daughter and three grandchildren.

Bruce A. Ware (PhD, Fuller Theological Seminary) is T. Rupert and Lucille Coleman Professor of Christian Theology at the Southern Baptist Theological Seminary. He has written numerous journal articles, book chapters, and book reviews, and is the author of God's Lesser Glory and God's Greater Glory.

Michael Horton (PhD, University of Coventry and Wycliffe Hall, Oxford) is the J. Gresham Machen Professor of Systematic Theology and Apologetics at Westminster Seminary in California. In addition to being the author of many popular and academic books, he is also the editor in chief of Modern Reformation magazine, a host of the White Horse Inn radio broadcast, and a minister in the United Reformed Churches.

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.