Michael Constantine (born Gus Efstratiou (Ευστρατίου); May 22, 1927 – August 31, 2021) was an American actor. He is most widely recognized for his portrayal of Kostas "Gus" Portokalos, the Windex bottle-toting Greek father of Toula Portokalos (Nia Vardalos), in the film My Big Fat Greek Wedding (2002). Earlier, he earned acclaim for his television work, especially as the long-suffering high school principal, Seymour Kaufman, on ABC's comedy-drama, Room 222, for which he won the Primetime Emmy Award for Outstanding Supporting Actor in a Comedy Series in 1970; he was again recognized by the Emmy Awards, as well as the Golden Globe Awards, the following year. After the conclusion of Room 222, Constantine portrayed night court magistrate Matthew J. Sirota on the 1976 sitcom Sirota's Court, receiving his second Golden Globe nomination. Constantine reprised his role as Gus Portokalos in My Big Fat Greek Wedding 2 (2016).
Constantine was born Gus Efstratiou in Reading, Pennsylvania. He was the son of Andromache (née Fotiadou) and Theocharis Ioannides Efstratiou (a steel worker), both immigrants from Greece.
He began his career on the New York stage 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 later married Kathleen Christopher, though they also later divorced.

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