Freud influenced the face of the 20th century through psychoanalysis. The conceptualisation of the sub-conscious, solving the psychodynamics of neuroses and the development of the psychoanalytical setting in order to research and treat mental dysfunctions are part of his prevailing achievements. The book follows the development of his scientific progress alongside his biography. Basic terms and concepts of psychoanalyses are explained comprehensively and links to current convictions showed. The presentation paints a vivid picture of Freud as human being and scientist supplemented with pictures and tables.