Muhammad Ali

Boxer, philanthropist, social activist. Born Cassius Marcellus Clay, Jr. on January 17, 1942, in Louisville, Kentucky. Once one of the top American boxers, Muhammad Ali has shown that he is not afraid of any fight—inside or outside the ring. Growing up in the segregated South, Ali experienced firsthand the prejudice and discrimination that African-Americans faced during this era.

At the age of 12, Ali discovered his talent for boxing through an odd twist of fate. His bike was stolen, and Ali told a police officer, Joe Martin, that he wanted to beat up the thief. "Well, you better learn how to fight before you start challenging people," Martin reportedly told him at the time. In addition to being a police officer, Martin also trained young boxers at a local gym.

Ali started working with Martin to learn how to box, and soon began his boxing career. In his first amateur bout in 1954, he won the fight by split decision. Ali went on to win the 1956 Golden Gloves Championship for novices in the light heavyweight class. Three years later, he won the Golden Gloves Tournament of Champions and the Amateur Athletic Union's national title for the light-heavyweight division.

In 1960, Ali won a spot on the U.S. Olympic Boxing Team. He traveled to Rome, Italy, to compete. At 6 feet 3 inches tall, Ali was an imposing figure in the ring. He was known for his footwork, and for possessing a powerful jab. After winning his first three bouts, Ali then defeated Zbigniew Pietrzkowski from Poland to win the gold medal.

After his Olympic victory, Ali was heralded as an American hero. He soon turned professional with the backing of the Louisville Sponsoring Group. During the 1960s Ali seemed unstoppable, winning all of his bouts with majority of them being by knockouts. He took out British heavyweight champion Henry Cooper in 1963 and then knocked out Sonny Liston in 1964 to become the heavyweight champion of the world.

Often referring to himself