Mark Mittelberg (MA, Trinity Evangelical Theological School) is an author, speaker, and evangelism strategist. He is co-author with Bill Hybels of Becoming a Contagious Christian and co-author with Bill Hybels and Lee Strobel of the Becoming a Contagious Christian curriculum. His books are widely considered standard texts on evangelism, including his newest books Choosing Your Faith and The Unexpected Adventure, co-authored with Lee Strobel. He previously served as evangelism leader for the Willow Creek Association.