page_title: Leonarde Keeler
hierarchical_section_title: Leonarde Keeler
caption_attribution_description: English: American inventor Leonarde Keeler (1903-1949) testing his lie-detector on Dr. Kohler, a former witness for the prosecution at the trial of Bruno Hauptmann.
context_page_description: Leonarde Keeler 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.
context_section_description: 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.
caption: Leonarde Keeler testing his lie-detector on a former witness for the prosecution at the trial of Bruno Hauptmann in 1937
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