George Barna is the president and founder of Barna Research Group. Barna has developed seminars for clients such as The Billy Graham Association, Campus Crusade for Christ, and The Prison Fellowship. His other clients include Prudential, Sothwestern Bell, The Walt Disney Company, and Visa USA. He has also served as a pastor of a southern California church. Barna has written many books on the church and culture including The Habits of Highly Effective Churches, User Friendly Churches, and Marketing the Church. His work has been quoted in Newsweek, Time, USA Today and the Wall Street Journal.