Nicknamed "Iron Man", Mueller was the starting catcher in every game the Cincinnati Reds played — 155 — during the wartime 1944 season.

During a 14-year Major League career, Mueller played for the Cincinnati Reds, Boston Braves, Pittsburgh Pirates and New York Giants.

After his playing career, Mueller managed in minor league baseball and coached in the Majors for the Giants (1956), Chicago Cubs (1957) and Cleveland Indians (1966).

[4] The following season, 1945, Mueller was called to military service by the United States Army — putting his consecutive game streak on hold until 1946.

[1] He led National League catchers three times in assists, twice each in baserunners caught stealing and once in fielding percentage and putouts.