UnChristian, You Lost Me, and Good Faith are coauthored by David Kinnaman. He is the founder and president of Barna Group, a major research and communications firm that works with churches, organizations, and companies ranging from film studios to financial services. David has conducted over one million interviews and led hundreds of U.S. studies since 1995. as well as international research investigations He and his wife, along with their three children, live in California.