John Piper is founder and teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. For 33 years, he served as pastor of Bethlehem Baptist Church, Minneapolis, Minnesota. He is author of more than 50 books, including Desiring God: Meditations of a Christian Hedonist and most recently What Is Saving Faith?

Matt Chandler is a lead pastor at The Village Church in DFW, president of the Acts 29 church planting network, and the author of Joy in the Sorrow: How a Thriving Church (and its Pastor) Learned to Suffer Well.