| Leonard Benedict Loeb | |
| Birth Date: | 16 September 1891 |
| Birth Place: | Zürich, Switzerland |
| Death Place: | Monterey, California, U.S. |
| Fields: | Physics |
| Workplaces: | University of California, Berkeley |
| Alma Mater: | University of Chicago |
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| Doctoral Advisor: | Robert Andrews Millikan |
| Doctoral Students: | Norris Bradbury Arthur F. Kip |
| Known For: | Gaseous electronics |
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| Children: | Anne Bredon |
Leonard Benedict Loeb (September 16, 1891 – June 17, 1978) was a Swiss-born American physicist.[1] [2] [3] He was the son of Jacques Loeb a German-born American physiologist and biologist.Leonard B. Loeb wrote a number of physics books, including Atomic Structure.[4]