John Piper (DTheol, University of Munich) is the founder and teacher of desiringGod.org and the chancellor of Bethlehem College & Seminary. He served for 33 years as the senior pastor of Bethlehem Baptist Church in Minneapolis, Minnesota, and is the author of more than 50 books, including Desiring God, Don't Waste Your Life, This Momentary Marriage, Bloodlines, and Does God Desire All to Be Saved? David Mathis serves as executive editor at desiringGod.org, pastor at Cities Church, and adjunct professor at Bethlehem College and Seminary. He and his wife, Megan, have three children.