Bill Klem, American baseball player and umpire (died 1951)

William Joseph Klem, known as "the Old Arbitrator", was an American baseball umpire who worked in Major League Baseball from 1905 to 1941, spending his entire career in the National League (NL). He worked 18 World Series, which is a major league record. Klem was posthumously inducted into the Baseball Hall of Fame in 1953.