Barry Greenstein is the "the Robin Hood of poker", because since 2008 he is donating all his net winning to children's charity. He has won three World Series of Poker bracelets, two World Poker Tour titles and has many other achievements in his career.
Greenstein wrote a book in 2005 called "Ace on the River", a copy of which he gives out for free along with an autograph and details of his hand, whenever someone eliminates him in a tournament.