William Graham Tullian Tchividjian (pronounced cha-vi-jin) is a Florida native, the pastor of Coral Ridge Presbyterian Church in Fort Lauderdale, a visiting professor of theology at Reformed Theological Seminary, and a grandson of Billy and Ruth Graham.

A graduate of Columbia International University (philosophy) and Reformed Theological Seminary in Orlando, Tullian is the author of Do I Know God? Finding Certainty in Life’s Most Important Relationship (Multnomah), Unfashionable: Making a Difference in the World by Being Different (Multnomah) and Surprised by Grace: God's Relentless Pursuit of Rebels (Crossway). Tullian is also a contributing editor to Leadership Journal. He speaks at conferences throughout the U.S. and his sermons are broadcast daily on the radio program "Godward Living."

When he is not reading, studying, preaching, or writing, he enjoys being with people and relaxing with his wife Kim and their three kids Gabe, Nate, and Genna. Tullian loves the beach, loves to exercise, and when he has time, he loves to surf.

Some of Tullian’s favorite authors include C.S. Lewis, J.I. Packer, Francis Schaeffer, Jonathan Edwards.