David Kinnaman, is the coauthor of unChristian and author of You Lost Me. He is president and majority owner of Barna Group, where he has supervised or directed interviews with more than 500,000 individuals and overseen hundreds of nationwide, representative research studies. Barna Group's body of research is frequently quoted in major media outlets such as USA Today, The Wall Street Journal, CNN, and the New York Times. Kinnaman speaks on topics including cultural and spiritual trends, teenagers and young adults, leadership and influence, and vocation and calling. He and his wife, Jill, live in California with their three children.