Banksy: The Man Behind the Wall

While hiding from the limelight, Banksy has made himself into one of the world's best-known living artists. His pieces have fetched millions of dollars at prestigious auction houses. He was nominated for an Academy Award for his film Exit Through the Gift Shop. Once viewed as vandalism, his work is now venerated; fans have gone so far as to dismantle the walls that he has painted on for collection and sale.

But as famous as Banksy is, he is also utterly unknown—he conceals his re…