In 1897 a summer theatre was initiated in Bad Aussee, with Jarno as its first director. Two years later he gave up the job and moved to Vienna to take over as the leader of the Theater in der Josefstadt.
In Vienna, Jarno could carry out his ideas about modern drama. He brought plays by Henrik Ibsen, August Strindberg, Arthur Schnitzler and George Bernard Shaw onto the stage. Jarno worked in Vienna until 1923. During this time, he married the actress Johanna Niese.
In 1905, Jarno bought the Fürst-Theater and lead it in parallel with the Theater in der Josefstadt. In 1926 he assumed leadership of the Renaissance-Bühne theatre in Vienna.
Jarno died in 1932 and is buried in the Zentralfriedhof in Vienna.