Harry Lonsdale | |
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| Born | January 19, 1932 Westfield, New Jersey, U.S. |
| Died | November 11, 2014 (aged 82) Indio, California, U.S. |
| Alma mater | Rutgers University |
| Occupation(s) | Businessman, scientist |
| Political party | Democratic |
Harold K. Lonsdale (January 19, 1932 – November 11, 2014) was an American scientist, businessman, and politician. A Democrat, he ran for United States Senate in the U.S. state of Oregon three times, losing twice in the primaries and once as the Democratic candidate, losing in the 1990 general election to incumbent Republican Mark Hatfield. In 2011 Lonsdale sponsored a research challenge to determine the origin of life on Earth.