Ed Rooney is a fictional character from the 1986 film Ferris Bueller's Day Off. He serves as the principal of Shermer High School and is known for his strict demeanor and relentless pursuit of students who skip school. Rooney is particularly focused on catching the film's protagonist, Ferris Bueller, in his attempts to enjoy a day off. In the movie, Ed Rooney's character is portrayed as somewhat bumbling and overzealous, often leading to humorous situations. His interactions with other characters, including Ferris's sister, Jeanie, and his attempts to confront Ferris highlight his role as an antagonist in the story.