Muhammad Ali is truly a living legend. His presence has dominated the world of sports much the same way the influence of Elvis dominates the world of music. Muhammed Ali changed the way we look at athletes. He changed our expectations. After he burst on the scene by knocking out Sonny Liston in 1964, the world of sports was never the same. People simply adore Ali. Nearly 20 years after his last professional fight, he still draws a mob of admirers wherever he goes. And Ali is famously approachable. He will sign autographs and pose for pictures until he is physically exhausted.