His Productive Thinking was published posthumously in 1945.  Earlier, he had earned his doctorate by inventing a lie detector for the objective study of testimony.  His greatest discovery came due to the perceptions he experienced on a train trip in 1910, which led him to experiment with a stroboscope.  The central tenet of his belief was Pragnanz, or "precision," in organization, a concept he formulated after his enunciation of the phi phenomenon.  FTP, name this man who, with Koffka and Kohler, founded Gestalt psychology.
His Productive Thinking was published posthumously in 1945.  Earlier, he had earned his doctorate by inventing a lie detector for the objective study of testimony.  His greatest discovery came due to the perceptions he experienced on a train trip in 1910, which led him to experiment with a stroboscope.  The central tenet of his belief was Pragnanz, or "precision," in organization, a concept he formulated after his enunciation of the phi phenomenon.  FTP, name this man who, with Koffka and Kohler, founded Gestalt psychology.
His Productive Thinking was published posthumously in 1945.  
Max Wertheimer