Michael Constantine (May 22, 1927 - August 31, 2021) was a Greek-American actor.
Constantine was born Constantine "Gus" Efstratiou in Reading, Pennsylvania. He was the son of Theocharis Efstratiou Ioannides and Andromache Fotiadou Efstratiou, both immigrants from Greece.
For many years he was best known for his portrayal of principal Seymour Kaufman in the series Room 222 (1969-1974). He also played Santa in the 1989 film Prancer.
In 2002, he enjoyed an unexpected comeback as the Windex-toting Gus Portokalos in the surprise hit movie My Big Fat Greek Wedding, a role he reprised in the short-lived television series My Big Fat Greek Life.
He married actress Julianna McCarthy (b. August 17, 1929 in Erie, Pennsylvania) on October 5, 1953, and they had 2 children: Thea Eileen and Brendan Neil. The marriage ended in divorce in 1969. Constantine married Kathleen Christopher in 1974 but that marriage also ended in divorce in 1980.