ABSTRACT
In Germany Medical Psychology was commonly understood as Psychopathology until the mid-20th century. Especially Ernst Kretschmer (1888-1964) and Paul Schilder (1886-1964) can be named as authors who contributed to this particular field representing a basis of psychiatry. With his textbook 'Klinische Psychologie' published in 1946, Willy Hellpach (1877-1955), a neuropsychiatrist and professor of psychology, established a new understanding of this part of Applied Psychology. His statement: "All forms of mental behaviour in somatic diseases are subject of Clinical Psychology " has fallen into oblivion. Although presented as Clinical Psychology has conception is basically medical-psychological. We intend to outline Hellpach's biography and to describe - thereafter - the development of his Clinical, i.e. Medical Psychology and its subjects. We hope that medical psychologists, especially in Germany, but in other countries, too, will absorb Hellpach's ideas and will begin to appreciate his importance for the configuration of a modern Medical Psychology.
