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Since the 1970s, Birn conducted research at the Central Office of the State Justice Administrations for the Investigation of National Socialist Crimes in Germany. She was sharply critical of the 1996 book by Daniel Goldhagen, Hitler's Willing Executioners, who she accused of being highly selective with the materials from the Central Office in her article "Historiographical review: Revising the Holocaust", published in The Historical Journal.

Ruth Bettina Birn (born 1952) is a Canadian historian and author whose main field of research is the security forces of Nazi Germany and their role in the Holocaust. For nearly 15 years, she held a position of chief historian in the war crimes section at the Canadian Department of Justice. Birn co-authored A Nation on Trial: The Goldhagen Thesis and Historical Truth with Norman Finkelstein.

Ruth Bettina Birn was born in 1952 in Stuttgart, West Germany. In 1985, she received her PhD from the Stuttgart University with the dissertation Die Höheren SS-und Polizeiführer: Himmlers Vertreter im Reich und in den besetzten Gebieten ("Higher SS and Police Leaders: Himmler's Representatives in the Reich and the Occupied Territories"), published in Düsseldorf in 1986 as a book. From 1991 to 2005, she was the chief historian at the War Crimes and Crimes Against Humanity Section of the Canadian Department of Justice.

Birn studied the Estonian Security Police and SD, publishing a book on this topic, Die Sicherheitspolizei in Estland 1941 – 1944: Eine Studie zur Kollaboration im Osten ("The Security Police in Estonia 1941 – 1944: A Study in Collaboration in the East"). Based on hundreds of Security Police investigation files kept in the Estonian State Archives, the book analyzes the persecution policies against various victim groups: Communists, Jews, Roma, Russians, Soviet prisoners of war, and so-called asocials.