Muhammad Ali ( ah-LEE; born Cassius Marcellus Clay Jr.; January 17, 1942 – June 3, 2016) was an American professional boxer and activist. A global cultural icon, widely known by the nickname "the Greatest", he is often regarded as the greatest heavyweight boxer of all time. He held the Ring magazine heavyweight title from 1964 to 1970, was the undisputed champion from 1974 to 1978, and was the WBA and Ring heavyweight champion from 1978 to 1979. In 1999, he was named Sportsman of the Century by Sports Illustrated and the Sports Personality of the Century by the BBC. Born in Louisville, Kentucky, he began training as an amateur boxer at age 12. At 18, he won a gold medal in the light heavyweight division at the 1960 Summer Olympics and turned professional later that year. He joined the Nation of Islam (NOI) in the early 1960s, but later transitioned to Sunni Islam in the mid-1970s after the death of NOI's longtime leader, Elijah Muhammad. He won the world heavyweight championship, defeating Sonny Liston in a major upset on February 25, 1964, at age 22. During that year, he denounced his birth name as a "slave name" and formally changed his name to Muhammad Ali. In 1967, Ali refused to be drafted into the military, owing to his religious beliefs and ethical opposition to the Vietnam War, and was found guilty of draft evasion and stripped of his boxing titles. He stayed out of prison while appealing the decision to the Supreme Court, where his conviction was overturned in 1971. He did not fight for nearly four years and lost a period of peak performance as an athlete. Ali's actions as a conscientious objector to the Vietnam War made him an icon for the larger counterculture of the 1960s generation, and he became a prominent, high-profile figure of racial pride for African Americans during the civil rights movement and throughout his career. Ali fought in several highly publicized boxing matches, including fights with Liston, Joe Frazier (including the Fight of the Century, which at the time was the biggest boxing event, and the Thrilla in Manila), and George Foreman in The Rumble in the Jungle. At a time when many boxers let their managers do the talking, Ali became renowned for his provocative and outlandish persona. He was famous for trash talking, often free-styled with rhyme schemes and spoken word poetry, and is identified as a pioneer in hip-hop. He often predicted in which round he would knock out his opponent. As a boxer, Ali was known for his unorthodox movement, footwork, head movement, and rope-a-dope technique, among others. Outside boxing, Ali performed as a spoken word artist, releasing two studio albums: I Am the Greatest! (1963) and The Adventures of Ali and His Gang vs. Mr. Tooth Decay (1976). Both albums received Grammy Award nominations. He also featured as an actor and writer, releasing two autobiographies. Ali retired from boxing in 1981 and focused on religion, philanthropy, and activism. In 1984, he made public his diagnosis of Parkinson's syndrome, which some reports attributed to boxing-related injuries, though he and his specialist physicians disputed this. He remained an active public figure, but in his later years made fewer public appearances as his condition worsened, and was cared for by his family until his death in 2016.