In Dresden, Deutsch played Franz Moor in Schiller's The Robbers and Moritz Stiefel in Frank Wedekind's Spring Awakening.

His performance in the title role of Hasenclever's The Son, which premiered on 8 October 1916, established him as an Expressionist actor; he also appeared in the play in 1918 and 1923.

He appeared until 1933 on a number of stages in the city, gave guest performances in Hamburg, Munich and Vienna, and participated in a tour of South America.

Deutsch returned to Vienna and Prague, gave guest performances in Zürich, Brussels and (in 1936) London where he appeared in Charles Bennett's play Page From a Diary in the West End.

[6] At the National Theatre Deutsch appeared in The Helpers of God, about Red Cross founder Henri Dunant, in 1948.

[7] Deutsch's performances in the title role of Gotthold Ephraim Lessing's Nathan the Wise and as Shylock in Shakespeare's The Merchant of Venice were critically praised.