Why Is Muhammad Ali Considered the Greatest of All Time?

Nigel Collins Was Ali really 'The Greatest'? via ESPN.com

Nigel Collins Was Ali really 'The Greatest'?
via ESPN.com

He is simply ... The Greatest via ESPN.com

He is simply ... The Greatest
via ESPN.com

THE BASICS: Muhammad Ali is generally considered the greatest boxer of all time. However, Nigel Collins and Larry Schwartz of ESPN differ on the reasons why. Collins writes  it was the intangibles, such as his charisma. While Schwartz believes it was all about his impact on our society.