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 is president-elect of Bethlehem College & Seminary and a teacher for desiringGod.org. He is a husband, father of three, and pastor at Cities Church. His most recent book is 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.