Wilhelm Kempff
In the 1920s and 1930s, she was a member of the Bornimer Kreis, a circle of architects, musicians, writers, and other artists and intellectuals; the nucleus of the Bornimer Kreis consisted of landscape architects Karl Foerster, Hermann Mattern, and Herta Hammerbacher. Members included pianist and composer Wilhelm Kempff, conductor and composer Wilhelm Furtwängler (whom Höcker later went on tour with), and architects Otto Bartning and Hans Poelzig.