Official Website: worldchallenge.org/davidwilkerson

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Via WIkipedia:

David Ray Wilkerson (May 19, 1931 – April 27, 2011) was an American Christian evangelist, best known for his book The Cross and the Switchblade. He was the founder of the addiction recovery program Teen Challenge, and founding pastor of the interdenominational Times Square Church in New York City.

Wilkerson emphasized such Christian beliefs as God’s holiness and righteousness, God’s love toward humans and especially Christian views of Jesus. Wilkerson tried to avoid categorizing Christians into distinct groups according to the denomination to which they belong.