For four years he taught at Duquesne University in Pittsburgh and went then to Europe where he continued his studies as répétiteur at the Schauspielhaus Zürich, in Bayreuth and in Köln (Cologne).
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A theatrical production of the play became a priority for Brecht on his return from exile in 1947; he helped to direct its premiere at the Schauspielhaus Zürich, where it opened on 5 June 1948, with scenic design by Teo Otto.