Mark Mittelberg is a best-selling author, sought-after speaker, and a leading strategist in evangelism and apologetics-oriented outreach. He is the primary author (with Lee Strobel and Bill Hybels) of the updated Becoming a Contagious Christian Training Course, through which more than a million people have learned to effectively and naturally communicate their faith to others.

Mark’s newest book, The Questions Christians Hope No One Will Ask, is based on a survey of 1000 Christians commissioned through the Barna organization, and deals with the ten issues that believers most want to avoid—but must not! Prior to that Mark collaborated with Lee Strobel to develop The Unexpected Adventure, a six-week devotional designed to inspire Christians and churches to enter into the excitement of sharing Christ. His previous book, Choosing Your Faith... In a World of Spiritual Options, strengthens the faith of believers and is a great resource to give to friends who are figuring out what to believe — and he’s developed a DVD study course for Christians based on that book, Faith Path: Helping Friends Find Their Way to Christ. Mark also wrote the articles for the Choosing Your Faith New Testament. His other books include the updated Becoming a Contagious Church, which sets forth an innovative blueprint for mobilizing churches for evangelism, and the classic best-seller Becoming a Contagious Christian, which he co-authored with Hybels. In addition, Mark was contributing editor for The Journey: A Bible for the Spiritually Curious, and a contributor to Reasons for Faith: Making a Case for the Christian Faith, edited by Norman Geisler and Chad Meister, and God Is Great, God Is Good: Why Believing in God Is Reasonable & Responsible, edited by William Lane Craig and Chad Meister — which won the 2010 Christianity Today award for best book in the area of apologetics and evangelism.

Mark was the evangelism director at Willow Creek Community Church in Chicago for seven years and for the Willow Creek Association for a decade. He is a frequent contributor for Outreach magazine, and he was an editorial consultant and periodic guest for Lee Strobel’s Faith Under Fire television show. He and Strobel have been ministry partners for over twenty years. After receiving an undergraduate degree in business, Mark earned a Master's Degree in Philosophy of Religion from Trinity Evangelical Divinity School in Deerfield, Illinois. In recognition of his achievements in the areas of evangelism and apologetics, he was recently honored by the conferring of a Doctor of Divinity degree from Southern Evangelical Seminary in Charlotte, North Carolina. Mark and his wife, Heidi, have two teenage children, and live near Denver, Colorado.