Sam Storms (PhD, University of Texas at Dallas) has spent more than four decades in ministry as a pastor, professor, and author. He is currently the senior pastor at Bridgeway Church in Oklahoma City, Oklahoma, and was previously a visiting associate professor of theology at Wheaton College from 2000 to 2004. He is the founder of Enjoying God Ministries and blogs regularly at SamStorms.com. D. A. Carson (PhD, Cambridge University) is research professor of New Testament at Trinity Evangelical Divinity School, where he has taught since 1978. He is a cofounder of the Gospel Coalition and has written or edited nearly 120 books. He and his wife, Joy, have two children and live in the north suburbs of Chicago. TIMOTHY KELLER is founder and pastor of Redeemer Presbyterian Church in New York. He is the best-selling author of The Prodigal God and The Reason for God.