Muhammad Ali, original name Cassius Marcellus Clay, Jr., (born January 17, 1942, Louisville, Kentucky, U.S.—died June 3, 2016, Scottsdale, Arizona), American professional boxer and social activist. Ali was the first fighter to win the world heavyweight championship on three separate occasions; he successfully defended this title 19 times.
Cassius Marcellus Clay, Jr., grew up in the American South in a time of segregated public facilities. His father, Cassius Marcellus Clay, Sr., supported a wife and two sons by painting billboards and signs. His mother, Odessa Grady Clay, worked as a household domestic.