As a performer Stefanos Koroneos has been seen in The Godson with Greek National Opera, La Cenerentola (Dandini and Don Magnifico) with New York City Opera, Il Barbiere di Siviglia ( Don Bartolo ) with New York City Opera in the Park Series , Tosca ( Il Sagristano) with Palm Beach Opera, Loft Opera , and Connecticut Opera ,El Gato con Botas (the King) with Gotham Chamber Opera Sacco e Vanzetti with Opera Tampa and Cassandra with Teatro Grattacielo, Gluck’s Orfee (title role) with National Municipal Theater Patras in Greece and Don Giovanni (Leporello) Opera in Williamsburg. Stefanos has performed throughout Italy in Il Viaggio a Reims (Don Alvaro), Madama Butterfly (Sharpless), Isabeau (the King), Rigoletto (Monterone), La Traviata (Barone), Le Nozze di Figaro (The Count), and Un Ballo in Maschera (Sam) in Theaters like Teatro Alla Scala , Rossini Opera Festival and Teatro Reggio di Parma . Additionally, he has performed internationally in La Traviata (Barone) with the Bolshoi Opera and at the Megaron Athens Concert Hall, Le Nozze di Figaro (the Count) inSeoul , La Bohème (Alcindoro and Benoit) at Oslo’s Den Nye Opera, La Bohème (Schaunard) at Staatstheater Freiburg, and La Forza del Destino (Fra Melitone) at Theater Osnabrück and Verdi Festival in Bussetto.