Willie is the groundskeeper and janitor at Springfield Elementary School and lives in a shack on the school premises. He is a Scotsman with an aggressive temper. Willie is an uncouth and unpleasant character, though essentially harmless. His personality is depicted as being incompetent, drunken, slow-witted, and quick to anger for little or no reason. Willie has shown antipathy to both his employer, Principal Skinner, and Bart Simpson, who frequently plays practical jokes on him. In Treehouse of Horror VI he plotted revenge on the students of Springfield Elementary after getting burned to death by their parents.