6. Hans Berger
Hans Berger was a German neurologist and the father of electroencephalography. Using EEG, he was the first to identify different brain rhythms or waves. The alpha wave rhythm is also currently known as Berger’s wave. He also described how EEG reading was altered when brain is affected by epilepsy or other diseases.
Berger experienced severe skin infection and a long period of clinical depression. Disillusioned by the rise of Nazism in Germany and the horrifying tragedies of the Second World War, he hanged himself on June 1941 in a clinic where he was treated.