Clint Eastwood sign invitation letter to Sylvester Stallone. Sylvester Gardenzio Stallone born July 6, 1946) is an American actor and filmmaker. After his beginnings as a struggling actor for a number of years upon arriving to New York City in 1969 and later Hollywood in 1974, he won his first critical acclaim as an actor for his co-starring role as Stanley Rosiello in The Lords Flatbush . Stallone subsequently found gradual work as an extra or side character in films with a sizable budget until he achieved his greatest critical and commercial success as an actor and screenwriter, starting in 1976 with his role as boxer Rocky Balboa, in the first film of the successful Rocky series (1976–present), for which he also wrote the screenplays In the films, Rocky is portrayed as an underdog boxer who fights numerous brutal opponents, and wins the world heavyweight championship twice.Clinton Eastwood Jr. (born May 31, 1930) is an American actor and film director.