Brock, Lou (Louis Clark Brock), 1939–, American baseball player, b. El Dorado, Ark. Best known for his extraordinary base running, Brock was signed by the Chicago Cubs in 1961, moved up to the majors the following year, and was traded to the St. Louis Cardinals in 1964. He led the National League in steals for eight seasons and in his 19-year career stole 938 bases, a record that stood until Rickey Henderson broke it in 1991. A consistent hitter, Brock ended his career with 3,023 hits, 149 home runs, and a .293 average. He was elected to the Baseball Hall of Fame in 1985.