John Piper is founder and teacher of Desiring God and chancellor of Bethlehem College and 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 Foundations for Lifelong Learning: Education in Serious Joy.

Randy Alcorn is a best-selling author of many books and the director of Eternal Perspective Ministries.

Jerry Bridges was an author, speaker, and staff member of The Navigators.

Helen Roseveare was a missionary, doctor, and author.

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.