Barry Greenstein is a professional poker player and author known for donating a significant portion of his tournament winnings to charity, earning him the nickname “The Robin Hood of Poker.” He has won three WSOP bracelets and two WPT titles, and he wrote the influential book Ace on the River, which blends strategy with philosophy and life lessons. Greenstein is a respected elder statesman of the poker world, known for his sportsmanship and generosity.