Michael Gerard Hagerty(May 10, 1954 – May 5, 2022) was an American actor. He was known for playing comedicblue-collar workers, including his recurring roles as Mr. Treeger, thebuilding superintendent, onFriendsand the manager of a muffler shop onHBO'sLucky Louie.Hagerty started acting after being invited byJim Belushito join the improv groupThe Second City.He went on to co-write and co-star in three revues on the troupe's mainstage during the 1980s (Also Available in Paperback — A Retrospective, Orwell That Ends Well, andTrue Midwest, or No, But I Saw the Movie).He also introduced the lyrics of "Bear Down, Chicago Bears" to its cast and had them memorize and sing the song.He subsequently began acting in films and television shows, beginning withDoctor Detroitin 1983. Hagerty became known for hismustacheand thickChicago accent.Although the majority of his career was spent in television, Hagerty had small roles in many films, and ultimately garnered over 100 acting credits throughout his career. He was recognized for his small character roles in a wide range of popular comedies, includingMartin,Cheers,The Wayans Bros.,Curb Your Enthusiasm, Friends, Seinfeld, andThe Wonder Years.He was one of twenty actors to appear in bothFriendsandSeinfeld. Hagerty was also a regular onThe George Carlin Show, which was his first recurring television role. One of his final acting roles was Somebody Somewhere,which he was still filming at the time of his death.