| Name | Date of Birth | Date of Death |
|---|---|---|
| Karl Popper | July 28, 1902 | September 17, 1994 |
| Ludwig Wittgenstein | April 26, 1889 | April 29, 1951 |
| Otto Weininger | April 3, 1880 | October 4, 1903 |
| Paul Feyerabend | January 13, 1924 | February 11, 1994 |
| Rudolf Steiner | February 5, 1861 | March 30, 1925 |