Mark Mittelberg is a best-selling author and international speaker. His books include The Unexpected Adventure (with Lee Strobel), The Questions Christians Hope No One Will Ask (With Answers), and Confident Faith. He is also the primary author of the award-winning Becoming a Contagious Christian training course (with Lee Strobel and Bill Hybels), which has been translated into more than 20 languages and used by more than 1,500,000 people around the world.

Lee Strobel was the award-winning legal editor of The Chicago Tribune and is the bestselling author of The Case for Christ, The Case for Christ Devotional, The Case for Christianity Answer book, The Case for Faith, The Case for a Creator, and The Case for Grace.

With a journalism degree from the University of Missouri and a Master of Studies in Law degree from Yale, Lee has won four Gold Medallions for publishing excellence and coauthored the Christian Book of the Year. He serves as Professor of Christian Thought at Houston Baptist University.