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

Joe Rigney serves as a fellow of theology at New Saint Andrews College. He is a husband, a father of three, and the author of a number of books, including More Than a Battle: How to Experience Victory, Freedom, and Healing from Lust.

Justin Taylor is Executive Vice President for Book Publishing and Publisher for Books at Crossway. He blogs at Between Two Worlds. He and his wife have five children.