Bill Hybels is the founding and senior pastor of Willow Creek Community Church in South Barrington, Ill., and chairman of the board for the Willow Creek Association. The bestselling author of more than twenty books, including Leadership Axioms, Holy Discontent, Just Walk Across the Room, The Volunteer Revolution, and Courageous Leadership, and classics such as Too Busy Not to Pray and Becoming a Contagious Christian, Hybels is known worldwide as an expert in training Christian leaders to transform individuals and their communities through the local church. He and his wife, Lynne, have two adult children and two grandsons, Henry and Mac.
Mark Mittelberg (MA, Trinity Evangelical Theological School) is an author, speaker, and evangelism strategist. He is coauthor with Bill Hybels of Becoming a Contagious Christian and coauthor with Bill Hybels and Lee Strobel of the Becoming a Contagious Christian curriculum. He previously served as evangelism leader for the Willow Creek Association.