Wilkerson was known for his outreach to street gangs, which he started after viewing a photo in Life magazine of New York City teens charged with murder.
He founded Teen Challenge, a ministry to gang members and drug addicts, in New York in 1959. In 1963, he co-authored his best-selling story, which Christianity Today listed in 2006 in the No. 32 spot on its "Top 50 Books That Have Shaped Evangelicals."
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