D.A. Carson is research professor of New Testament at Trinity Evangelical Divinity School in Deerfield, Illinois. He is a founding member and currently president of The Gospel Coalition, and the author of How Long, O Lord?

Joe Rigney is assistant professor of theology and literature at Bethlehem College & Seminary and author of The Things of Earth: Treasuring God by Enjoying His Gifts. He is a pastor at Cities Church.

Justin Taylor is Senior Vice President and Publisher for Books at Crossway and an elder at New Covenant Bible Church in St. Charles, Illinois. He blogs at Between Two Worlds. He and his wife have four children.