Mary Peters Fieser | |
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| Born | May 27, 1909 Atchison, Kansas, US |
| Died | March 22, 1997 (aged 87) |
| Nationality | American |
| Alma mater | Bryn Mawr College, US; Radcliffe College, US |
| Known for | synthesizing vitamin K; writing organic chemistry textbooks |
| Spouse | Louis Fieser (1932–1977) |
| Awards | Garvan–Olin Medal (1971) |
Mary Peters Fieser (May 27, 1909 – March 22, 1997) was an American chemist best known for the many books she wrote with her husband Louis Fieser.