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After college, Mason worked for the AA baseball team Portland Sea Dogs and as Director of Administration for the QJMHL hockey team Lewiston Maineiacs.
He has designed logos for Minor League baseball teams, including the Portland Sea Dogs, Norwich Navigators, and New Britain Rock Cats, and also designed the J. League football team Shimizu S-Pulse's mascot, Palchan.
In a game against the Portland Sea Dogs in August 2011, Gronauer hit a three-run home run at Fenway Park (home of the Boston Red Sox) over the Green Monster in the 11th inning.