Kurt Goldstein was a German neurologist and psychiatrist who created a holistic theory of the organism. Educated in medicine, Goldstein studied under Carl Wernicke and Ludwig Edinger where he focused on neurology and psychiatry. His clinical work helped inspire the establishment of The Institute for Research into the Consequences of Brain Injuries. Goldstein was forced to leave Germany when Hitler came to power because of his Jewish heritage. After being displaced, Goldstein wrote The Organism (1934). This focused on patients with psychological disorders, particularly cases of schizophrenia and war trauma, and the ability of their bodies to readjust to substantial losses in central control. His holistic approach to the human organism produced the principle of self actualization, defined as the driving force that maximizes and determines the path of an individual. Later, his principle influenced Abraham Maslow's hierarchy of needs. He was the co-editor of Journal of Humanistic Psychology.