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

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.

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) is Distinguished Research Professor Emeritus of Theology and Biblical Studies at Phoenix Seminary in Phoenix, Arizona. He is the author of more than twenty-five books, including Bible Doctrine and Christian Beliefs.

Mark Talbot(PhD, University of Pennsylvania) is an associate professor of philosophy at Wheaton College and the host of the When the Stars Disappear podcast. He is also the author of the Suffering and the Christian Life series, including When the Stars Disappear and Give Me Understanding That I May Live. 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 Reformationmagazine, a host of the White Horse Innradio 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.