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Tom Hallion

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Thomas Francis Hallion (born September 5, 1956) is an American retired Major League Baseball umpire who worked in the National League (NL) from 1985 to 1999 and in both major leagues from 2005 until 2022. He was promoted to crew chief in 2010. Hallion has worn number 20 during his MLB career. He resigned from the NL in 1999 as part of a failed mass bargaining strategy, but he was rehired by MLB before the 2005 season.