Mullen was born in Olympia, Washington. He received the nickname "Moon" after the popular comic strip character "Moon Mullins". Mullen attended the University of Oregon, where he played baseball and basketball. He was a reserve guard on the 1938–39 Oregon Ducks men\'s basketball team coached by Howard Hobson, and winners of the first ever NCAA Men\'s Division I Basketball Tournament. On the baseball team (also coached by Hobson), he played third base, catcher, and second base.\n', '

In 1944, Mullen played 118 games for the Philadelphia Blue Jays (as the Philadelphia Phillies were briefly known), posting a .267 batting average (124-for-464) with 51 runs and 31 RBI, including nine doubles, four triples, four stolen bases, and a .315 on-base percentage with no home runs. Following the 1944 season, Mullen was one of many major leaguers who saw his baseball career interrupted by a stint in the United States Army during World War II. He served several years, then attended spring training with the Phillies but did not make the team. He played several years in the Pacific Coast League, for teams like the Seattle Rainiers and the Portland Beavers. He then managed the 1950 Boise Pilots of the Pioneer League.\n', '

He was married to his wife Jessie, whom he met at a high school football game, for 72 years. After his baseball career, he returned to Olympia where he coached the Olympia High School baseball team and taught high school biology and zoology for 27 years before his retirement.\n', '

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