The New York pastor explains why he's taking his ministry model on the road. Tim Keller, pastor of Redeemer Presbyterian Church in Manhattan and cofounder of the Gospel Coalition, is behind some of the most ambitious — if not the most radical — efforts to reach urban professionals. Now he's expanding his ministry in book form, with the publication of The Reason for God, which moved its way up to number seven on The New York Times nonfiction bestseller list. Keller's book tour