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Tarr was the head college football coach for the AdrianBulldogs located in Adrian, Michigan. He held that position for the 1903 and 1904 seasons. His coaching record at Adrian was 7 wins and 6 losses. As of the conclusion of the 2010 season, this ranks him #12 at Adrian in total wins and #6 at the school in winning percentage (.538). He was also coached at Mercer for the 1906 season where he compiled a record of 2–3.