This biography will have your readers on the edge of their seats. Muhammad Ali was a triple threat: heavyweight boxing champion, civil rights activist, and international sports icon. One of the most influential figures of the twentieth century, Ali dominated professional boxing for more than a decade in the 1960s and 1970s. Brash and outspoken, he proclaimed "I am the greatest." He backed it up. A true rebel, he refused to serve in the U.S. Army during the Vietnam War, saying it violated his religious beliefs. And after retiring from boxing, Ali had one more fight: diagnosed with Parkinson's disease in 1984, he raised awareness of and funds for treatment and research for over 30 years. When he died in 2016, the world lost one of its most treasured and rebellious sports figures.