Rudolf Eisler

[2] In addition to Immanuel Kant, his philosophical writings, particularly those concerning phenomenalism, were largely influenced by Wundt, as well as Hermann Cohen and Edmund Husserl.

[3] Upon moving back to Vienna in 1901, he and his family settled in the "Matzos Quarter," a section of the city largely composed of working-class Jews.

[2] Eisler described his philosophical ideas as "objective phenomenalism," which he articulated as a combination of empirical realism and transcendental idealism.

With a firm understanding of the writings of Kant, his musings generally concerned the origins and construction of reality and truth.

[4] Ida Maria Fischer, the daughter of a Lutheran butcher, lived with Rudolf Eisler during his studies in Leipzig.