Wolfgang Köhler (Reval, 21 January 1887 – Enfield, 11 June 1967) was a German psychologist and leader of the school of gestalt psychology. He received his Ph.d. in 1909 Berlin at Carl Stumpf. After Berlin, he moved to the University of Frankfurt, where he and Kurt Koffka itself subjected to experiments on perception of movement, where Max Wertheimer had begun. Known for his introduction of the idea of ' sudden insight '. He suggested that the solution of a problem more often is the result of a sudden flash of insight, rather than a learning process of trial and error.