David Wilkerson was an American Christian pastor and author, best known for founding the Teen Challenge program, which helps individuals struggling with addiction. He gained national attention in the 1950s after he wrote the book "The Cross and the Switchblade," detailing his work with gang members in New York City. Wilkerson also established the Times Square Church in 1987, which became a prominent place of worship in Manhattan. His ministry focused on reaching out to the marginalized and promoting spiritual renewal, emphasizing the importance of faith and redemption in overcoming life's challenges.