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John Bertrand "Jocko" Conlan (December 6, 1899 - April 16, 1989) was a player, and more famously an umpire, in Major League Baseball.
Conlan began his major league career in 1934 as an outfielder for the Chicago White Sox. In 1935, however, Conlan was presented with an unusual opportunity. During a game against the St. Louis Browns, umpire Red Ormsby fell ill due to the heat and Conlan was asked to fill in. The following year Conlan made the transition from player to umpire complete, beginning in the minor leagues.
Conlan umpired in the National League from 1941 to 1964, officiating in five World Series (1945, '50, '54, '57 and '61) and six All-Star games (1943, '47, '50, '53, '58 and '62). He also umpired in the playoff series to decide the NL's regular-season champions in 1951, '59 and '62.
Conlan was elected to the Baseball Hall of Fame by the Committee on Baseball Veterans in 1974.