Leo Tolstoy | Pope Leo XIII | Leo Gorcey | Leo Burnett | Leo Brouwer | Leo VI the Wise | Leo | Pope Leo X | Leo Durocher | Wadada Leo Smith | Ted Leo | Pope Leo I | Pope Leo IX | Melissa Leo | Leo Carrillo | Ted Leo and the Pharmacists | Leo Castelli | Leo Burnett Worldwide | San Leo | Leo Strauss | Leo Marks | Leo Laporte | Léo Ferré | Leó Szilárd | Leo Slezak | Leo Frobenius | Leo Cárdenas | Pope Leo XII | Leonardo Leo | Leo Fall |
Recent productions have included lesser-known works by Carlo Goldoni, Leo Tolstoi, Eugène Labiche, Robert de Flers and Gaston de Caillavet, as well as modern works by Michel Vinaver (Les travaux et les jours) and Robert Pinget (Ici ou ailleurs) — also Molière's major classic George Dandin.
Siro was also sctive in the theatre, playing over 60 roles in his career, notably in Leo Tolstoi's Anna Karenina, Jean-Paul Sartre's The Respectful Prostitute, Tennessee Williams' A Streetcar Named Desire, Arthur Miller's A View From the Bridge, and Ken Ludwig's Lend Me a Tenor.