- In 1909 he started what was to become a 20-year partnership with Franz Arnold with whom he wrote more than 20 plays, mainly farces and operettas. Their first hit play was The Spanish Fly in 1913.
- In 1903 he moved to Berlin to the Residenztheater, then to Lustspielhaus in 1905, where he became Regisseur (Director) in 1906 and in 1908 Oberregisseur.
- He was an Austrian actor and playwright.
- Ernst Bach and Franz Arnold went on to become one of the leading play writing teams in Weimar Germany.
- In 1917 he became the director of the Muenchener Volkstheater in Munich, whilst continuing his writing partnership with Franz Arnold at Starnberg. He remained in Munish until his death in 1929.
- He made his debut as an actor at the Wiener Raimond Theater in 1899.
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