Lou Gehrig is an example of a player who played first base because he was not as strong a fielder as hitter. At or near the ends of their careers, good hitters are often moved to first base as their speed and throwing arms deteriorate, or their teams become concerned with the likelihood of injury. Such players include Hall of Famers Johnny Bench (originally a catcher), George Brett (third baseman), Ernie Banks (shortstop), Rod Carew (second baseman), Al Kaline (right fielder), Mickey Mantle (center fielder), Mike Piazza (catcher), and Mike Schmidt (third baseman). Only rarely does a player begin his major-league career at first base and go elsewhere, as with Jackie Robinson, a natural second baseman who was played at first base in his rookie season so that he would avoid the risk of malicious slides at second base. Hank Greenberg, a natural first baseman for the Detroit Tigers, moved to left field in his 11th major league season (1940) after his team acquired Rudy York, another slugging first baseman who was ill-suited to play anywhere else.