Jack Roosevelt Robinson was an American professional baseball player who became the first African American to play in Major League Baseball in the modern era. Robinson broke the baseball color line when he started at first base for the Brooklyn Dodgers on April 15, 1947. When the Dodgers signed Robinson, they heralded the end of racial segregation in professional baseball that had relegated black players to the Negro leagues since the 1880s. Robinson was inducted into the Baseball Hall of Fame in 1962.
During his 10-year MLB career, Robinson won the inaugural Rookie of the Year Award in 1947, was an All-Star for six consecutive seasons from 1949 through 1954, and won the National League Most Valuable Player Award in 1949—the first black player so honored. Robinson played in six World Series and contributed to the Dodgers' 1955 World Series championship.
In 1997, MLB retired his uniform number 42 across all major league teams; he was the first professional athlete in any sport to be so honored. MLB also adopted a new annual tradition, "Jackie Robinson Day", for the first time on April 15, 2004, on which every player on every team wears No. 42.