- Residences: Hamburg.
- Relation to Mahler: Friend of Gustav and Justine Mahler in Hamburg
- Correspondence with Mahler: Yes.
- 00-00-0000, Year
- Born: 00-00-0000
- Died: 00-00-0000
- Buried: 00-00-0000
A widow living in Hamburg. She and her daughter Toni Marcus (1876-1942) were particularly close friends of the Mahlers.
Her mother, Helene Hertz, is also mentioned in Gustav Mahlers’letters. Justine (Ernestine) Rose-Mahler (1868-1938) later made a trip to Italy with Adele Marcus.