Leonarde Keeler
(1903-1949)
Co-inventor of the polygraph
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Leonarde Keeler (October 30, 1903 – September 20, 1949) was the co-inventor of the polygraph. He was named after the polymath Leonardo da Vinci, and preferred to be called as 'Nard.' He was a Berkeley high school student and amateur magician. He was captivated by John Larson's machine - his so-called 'cardio-pneumo psychogram,' capable of detecting deception, and worked on it to produce the modern polygraph.
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| Born |
1903 North Berkeley, California
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| Died |
1949 (aged 45) Door County, Wisconsin
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