Leonarde Keeler (October 30, 1903 – September 20, 1949) was an American inventor best known for co-inventing the polygraph. He was named after the polymathLeonardo da Vinci, and preferred to be called Nard. He was a Berkeley high school student and amateur magician. He was captivated by John Augustus Larson's machine, a "cardio-pneumo psychogram", with the goal of detecting deception, and worked on it to produce the modern polygraph.
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![Leonarde Keeler testing his lie-detector on a former witness for the prosecution at the trial of [[Richard Hauptmann]] in 1937](https://upload.wikimedia.org/wikipedia/commons/8/8e/Leonarde_Keeler_1937.jpg)
Leonarde Keeler (October 30, 1903 – September 20, 1949) was an American inventor best known for co-inventing the polygraph. He was named after the polymath Leonardo da Vinci, and preferred to be called Nard. He was a Berkeley high school student and amateur magician. He was captivated by John Augustus Larson's machine, a "cardio-pneumo psychogram", with the goal of detecting deception, and worked on it to produce the modern polygraph.
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