Michael Constantine (born May 22, 1927) is an American actor of Greek descent.
He is probably now best known for his portrayal of Kostas "Gus" Portokalos, the Windex bottle-toting Greek father of Toula Portokalos (Nia Vardalos), in the 2002 surprise hit film My Big Fat Greek Wedding. Prior to that, he was well known for his extensive television work, especially as the long-suffering high school principal, Seymour Kaufman, on ABC's sitcom, Room 222, for which he won an Emmy Award as Best Supporting Actor in 1970. He played a night court magistrate, Matthew J. Sirota, on the brief 1976 sitcom, Sirota's Court.
Constantine was born Constantine Ioannides (Greek: Κωνσταντίνος Ιωαννίδης) in Reading, Pennsylvania, the son of Andromache Efstratiou (Ανδρομάχη Ευστρατίου) (née Fotiadou [Φωτιάδου]) and Theoharis Ioannides [Θεοχάρης Ιωαννίδης] (a steel worker), both immigrants from Greece.
He began his career on the New York stage and in the mid-1950s as understudy to Paul Muni in Inherit the Wind. While in the cast, he met and married actress Julianna McCarthy on October 5, 1953; they had two children, Thea Eileen and Brendan Neil. The marriage ended in divorce in 1969, the same year that Constantine began his role on Room 222.
He studied acting with such prominent mentors as Howard Da Silva. He was playing character roles on and off Broadway in his mid-twenties, supplementing his income as a night watchman and shooting-gallery barker. In 1959 he appeared in his first film, The Last Mile (1959). He had a small but memorable supporting role in The Hustler (1961). In 1964 and 1965 Constantine appeared on Perry Mason, both times as the murderer. He played the role of wannabe private eye Dillard in "The Case of the Blonde Bomber," then he played Pappy Ryan in "The Case of the Runaway Racer." In 1967 he appeared in the first part of "The Judgment," the two-episode conclusion of The Fugitive, starring David Janssen. Constantine played a long-suffering anti-organized-crime agent in Walt Disney's caper film The North Avenue Irregulars (1979), where he appeared alongside Edward Herrmann and Cloris Leachman. He also played an organized crime mobster who worked for Frank Nitti in the television version of the Untouchables.