Käthe Susmann was an Austrian writer, women's rights activist and entrepreneur. In younger years she was a governess with Oscar Edler von Hofmannsthal and around the turn of the century she was vice-president of the Erste Wiener Gabelsberger-Damen-Stenographen-Verein. After working in the Ministry of the Interior, she started writing in 1902 about the social situation of women, particularly factory workers, and the squalor in the slums, public hospitals and welfare institutions. Her articles in the Neues Wiener Tagblatt and Frankfurter Zeitung helped to improve the working conditions for women and to establish systematic unemployment benefit. In the 1920s she ran Filmexport, a film distribution business, at Siebensterngasse 42 in the 7th district. At the same time she was active in the Neuer Wiener Frauenclub, giving talks on the social situation of women and on women's emancipation. She was acquainted with the women's rights activist Yella Hertzka, wife of the music publisher Emil Hertzka. Through them she met the operetta composer Charles Weinberger, whom she married in 1930. After the annexation of Austria to the German Reich, she left the Jewish community on 29 August 1938 but was still regarded by the Nazis as a Jew and, as such, was no longer allowed to work. Following her husband's death in 1939, she applied to the welfare department of the city of Vienna for continued payment of his annuity, but the application was turned down and she offered to exchange Weinberger's art legacy for a lifelong pension from the city of Vienna. As this was impossible, the Stadtbibliothek (now Wienbibliothek – Vienna City Library) sought the opinion of the Reich Chamber of Culture in Berlin, which confirmed that Weinberger's works were not subject to an export ban, and she decided to put them up for sale. The estate was divided up between the Stadtbibliothek and the Historisches Museum (now Wien Museum). The library paid 1,150 Reichsmarks and the museum 600 Reichsmarks. These amounts were transferred to a frozen account to which Käthe Weinberger had no access, although she was allowed to organize her husband's estate for the library. It is not known how she escaped deportation and survived.

In 2001 the Vienna Restitution Commission recommended the return of Charles Weinberger's estate. In 2002 the successors of Käthe and Charles Weinberger waived their right and left the objects with the two institutions.