Religion Bleg

As a British American Project fellow and 2010 conference planning team member, I have a religion-related ask of all of you. I'm helping assemble a panel of folks who can talk about the notion of "freedom of religion" versus "freedom from religion." (The overall topic for the November conference is "freedom," suiting the Philadelphia location.) Tim Keller of Redeemer Presbyterian Church in New York City was recommended as a potential participant. Can anyone put me in contact with him?