It was with Luchino Visconti's company that Gassman achieved his mature successes, together with Paolo Stoppa, Rina Morelli and Paola Borboni. He played Stanley Kowalski in Tennessee Williams' "Un tram che si chiama desiderio" ("A Streetcar Named Desire"), as well as in "Come vi piace" ("As You Like It") by Shakespeare and "Oreste" (by Vittorio Alfieri). He joined the "Teatro Nazionale" with Tommaso Salvini, Massimo Girotti, Arnoldo Foà to create a successful "Peer Gynt" (by Henrik Ibsen). With Luigi Squarzina in 1952 he co-founded and co-directed the "Teatro d'Arte Italiano", producing the first complete version of "Hamlet" in Italy, followed by rare works such as Seneca's "Thyestes" and Aeschylus's "The Persians".