He is from Stillwater, Oklahoma, hence his nickname "The Cowboy" (Oklahoma State University is located in Stillwater, its mascot is the cowboy and its colors are orange, which Bartram usually wears).
His origin in Stillwater, Oklahoma, is the source of his nickname "The Cowboy" (Oklahoma State University's presence in Stillwater, its cowboy mascot, and the school's orange colors are all factors contributing to this nickname).