Tim Keller (MDiv, Gordon-Conwell Theological Seminary; DMin, Westminster Theological Seminary) is founder of Redeemer Presbyterian Church (PCA) in Manhattan, chairman of Redeemer City to City, and founder of The Gospel Coalition. He has written numerous books, including The Reason for God. He and his wife, Kathy, have three children.
Crawford Loritts (DDiv, Biola University; STD, Cairn University; DDiv, Moody Bible Institute; LTD, Trinity Evangelical Divinity School; DDiv, Columbia International University) is former senior pastor of Fellowship Bible Church in Roswell, Georgia, visiting professor at Trinity Evangelical Divinity School, and a Council member of The Gospel Coalition. He has written a number of books, including Unshaken. He and his wife, Karen, have four children.