Dr. Israel Charny, a Genocide scholar and executive director of the Institute on the Holocaust and Genocide in Jerusalem wrote that Bernard Lewis' "seemingly scholarly concern ... of Armenians constituting a threat to the Turks as a rebellious force who together with the Russians threatened the Ottoman Empire, and the insistence that only a policy of deportations was executed, barely conceal the fact that the organized deportations constituted systematic mass murder".[21] Charny compares the "logical structures" employed by Lewis in his denial of the genocide to those employed by Ernst Nolte in his Holocaust negationism.[22]