Hypotheses like the ones that Hitler's personality and behavior pointed to a personality disorder, to a posttraumatic stress disorder or to schizophrenia have not been undisputed, but they have repeatedly found endorsement from fellow psychiatrists.
Robert G. L. Waite, a psychohistorian at Williams College, has been working towards an interdisciplinary exploration of Nazism since 1949, combining historiographical and psychoanalytic methods.