Petros Fyssoun was born in Agrinio, Greece, his father was a Russian émigré, who was established in Greece after the Russian Revolution.
He graduated from the Dramatic School of Art Theatre in 1954.
Until 1956, he collaborated with the Art Theatre of Karolos Koun.
His repertoire has included all kinds of theatre, from drama, comedy and tragedy to burlesque.
He resided in Athens, and spoke English, Russian and Swedish.