John Isaiah Northrop | |
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| Born | October 12, 1861 New York City, United States |
| Died | June 27, 1891 |
| Occupation | Zoologist |
| Spouse | Alice Belle Rich |
| Parent(s) | John Isaiah Northrop and Mary Rosina Havemeyer |
| Relatives | See Havemeyer family |
John Isaiah Northrop, Ph.D. (12 October 1861 – 27 June 1891) was an American zoologist at Columbia University.