n 1960, a young boxer named Cassius Clay arrived in Miami, determined to become the world heavyweight champion. In the end, he became something more ? a legend. Combining rarely seen footage with interviews of those who were closest to him, including trainer Angelo Dundee and fight doctor Ferdie Pacheco, and commentary by bestselling Ali biographer Thomas Hauser, Pulitzer Prize-winning journalist David Remnick and Columbia University historian Manning Marable, Becoming Muhammad Ali is the story of that evolution.