Mrs Warren's Profession (a play of Victorian England, 1893) written by George Bernard Shaw (1856 - 1950) and produced in Germany, as KItty Warren, in 1907.

A scene from Frau Warrens Beruf as Kitty Warren (Mrs Warren's Profession, a play set in Victorian England, 1893), written by English playwright George Bernard Shaw (1856 - 1950) and produced by the Hebbel-Theater, directed by Richard Vallentin at the Central-Theater, Berlin, on 16 November 1907. In 1902 there was a first private performance of this play in London by the Stage Society. In 1906 the first public performances took place in New York, where the police appeared and arrested the entire stage staff.

Rosa Bertens in Kitty Warren

There she worked successfully in the naïve field and then moved to the Stadttheater in Cologne, from where she was appointed to the Deutsches Theater in Petersburg. In 1887 she joined the association of the Berlin Residenztheater, in 1894 she went to the Deutsches Theater and in 1895 back to the Residenztheater. In 1898 she moved to the Lessing Theatre, where she belonged until at least 1902. In 1911 she was a member of the Berlin Max Reinhardt Ensemble and played Iocaste alongside Ferdinand Bonn in Hofmannsthal's stage adaptation of King Oedipus.