- Performed on stage with husband Kosleck twice, once in Berlin in a production of "The Tribune" and again on Broadway in "The Madwoman of Chaillot" in 1950.
- Had four husbands. The first was Swiss classical pianist and conductor Edwin Fischer (1886-1960); the second was Emmerich von Jeszensky, an Austrian cavalry officer; her third was German film star Rudolf Forster; and her last was character actor Martin Kosleck.
- The turbulent relationship between Eleanora and husband Martin Kosleck was chronicled in the book "The Grand Surprise: The Journals of Leo Lerman" by Alfred A. Knopf (2007). Lerman, who was a close gay friend to Eleanora, claims that Kosleck had a male lover at the time of his wife's mysterious death in 1951. Her death was reported as a suicide although Lerman claims that after her death a pillow was found over Eleonora's face and a bath mat had been soaked in ether.
- Eleonora was named after her godmother, Eleonora Duse, the acclaimed Italian stage actress and tragedienne.
- Sister of Francesco von Mendelssohn and daughter of Robert Alexander Mendelssohn (a German banker) and Giulietta Gordighiani (a pianist and the daughter of the Italian portrait-painter Michele Gordigiani).
- The Italian tragedienne Eleonora Duse (1858-1924) had been a lover of her father, banker Robert von Mendelssohn, and he and Eleanora's mother, pianist Giuletta Gordigliani, named her after the great Duse.
- Once romantically involved with noted conductor Arturo Toscanini.
- Lived at 173 East 73rd Street, NYC.
- Father: Robert Alexander Mendelssohn; Mother: Giulietta Gordighiani.
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