Dr Hans Berger (1873-1941) Born and educated in Germany, Hans Berger in 1900 entered as an assistant in a psychiatric clinic headed by Otto Binswanger. Oscar Vogt and Korbinian Brodman were also assistants in the same clinic. Berger's research work centered on intra-cranial blood circulation, psycho physiology and brain temperature. Berger continued his studies on electrical activity in the human brain and in 1924 made the first electroencephalograph of man.