Cassius Keyser
| Cassius Jackson Keyser | |
|---|---|
 |
|
| Born | 15 May 1862 Rawson, Ohio, United States |
| Died |
8 May 1947 (aged 84) New York City, New York, United States |
| Citizenship | American |
| Nationality | American |
| Fields | Mathematics |
| Institutions | University of Missouri, New York State Normal School (now SUNY New Paltz), Washington University, Columbia University |
| Alma mater | Columbia University |
| Doctoral students | Eric Temple Bell, Emil Post, Edward Kasner |
| Known for | Foundation of mathematics |
| Spouse | Ella Maud Crow |
Cassius Jackson Keyser (May 15, 1862, Rawson, Ohio – May 8, 1947 New York City) was an American mathematician of pronounced philosophical inclinations.
Keyser's initial higher education was at North West Ohio Normal School (now Ohio Northern University), then became a school teacher and principal. In 1885, he married a fellow student at the Normal School, Ella Maud Crow of Ridgeway, Ohio. He completed a second undergraduate degree, a BSc, at the University of Missouri in 1892. After teaching there, at the New York State Normal School (now SUNY New Paltz), and at Washington University, he enrolled as a graduate student at Columbia University, earning the MA in 1896 and the Ph.D. in 1901. He spent the rest of his career at Columbia, becoming the Adrain Professor of Mathematics (1904–27) and Head of the department (1910–16). He retired in 1927.
Keyser was one of the first Americans to appreciate the new directions in the foundation of mathematics, heralded by the work of Europeans such as Richard Dedekind, Georg Cantor, Giuseppe Peano, Henri Poincaré, David Hilbert, Ernst Zermelo, Bertrand Russell, and A. N. Whitehead. He was also one of the first to appreciate the mathematical and philosophical importance of his fellow American Charles Sanders Peirce. Alfred Korzybski, founder of general semantics, named Keyser as a major influence. While at Columbia, Keyser supervised only two PhDs, but they both proved quite consequential: Eric Temple Bell and the logician Emil Post.
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