Facing Ali is a 2009 documentary directed by Pete McCormack about Muhammad Ali born Cassius Marcellus Clay, Jr. in Louisville, Kentucky as told from the perspectives of some of the notable opponents he faced during his career George Chuvalo, Sir Henry Cooper, George Foreman, Smokin Joe Frazier, Larry Holmes a former sparring partner of Ali, Ron Lyle, Ken Norton, Earnie Shavers, Leon Spinks and Ernie Terrell.
Former British champion Sir Henry Cooper briefly discusses the cumulative effects of boxing on Muhammad Alis health. He states that Ali actually suffers from Parkinsons Syndrome rather than Parkinsons Disease and that Alis doctor had personally told him that the cause was Ali taking frequent punches to the back of his neck and that these blows killed brain cells which trigger the release of an important chemical. George Chuvalo stated that he believes Alis condition was caused either by boxing and or a predisposition for the disease.Although eligible for nomination for an Academy Award in the documentary feature category, it was not so honored. However, it won awards at the Vancouver Film Critics Circle and the Vancouver International Film Festival. ........
Source: Wikipedia