Leonarde Keeler (1903–1949) 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 to produce modern polygraph.
Inventor of the polygraph, he insisted on playing the examiner in the movie "Call Northside 777" because he was sure that no actor could learn to use the machine properly.
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