Otto Strasser
The report used many sources to profile Hitler, including a number of informants, including Hitler's nephew, William Patrick Hitler, his family physician, Dr. Eduard Bloch, Ernst Hanfstaengl, Hermann Rauschning, Princess Stephanie von Hohenlohe, Otto Strasser, Friedlinde Wagner, and Kurt Ludecke. The so-called "Hitler Source Book" which was appended to the wartime report, ran over one thousand pages and was indexed against the report. The groundbreaking study was the pioneer of offender profiling and political psychology, today commonly used by many countries as part of assessing international relations.