Who was Adolf Hitler to the government?

His official title was Reichskanzler (Chancellor of the Realm) during the last years of the presidency of von Hindenburg. On von Hindenburg's death, the office of Reichspräsident which von Hindenburg had held was abolished, and Hitler assumed the presidential powers in addition to those of the chancellor under the title of Führer und Reichskanzler (Leader and Chancellor of the Realm).