Ernst Kaltenbrunner (1903-1965) was Führer and Chancellor of Germany for a brief period in 1965. Kaltenbrunner launched a war with the Race over Poland that led to his death and the deaths of most of Germany's leadership, and badly set back the country's fortunes for the remainder of the 20th Century.
When the Race invaded Earth in 1942, and after the Peace of Cairo was signed in 1945, Kaltenbrunner continued serving in the SS, ultimately becoming commander of the RSHA, a major security force comprised of many of the important police organizations in Germany. He held these posts throughout the reigns of Adolf Hitler and Heinrich Himmler, becoming Himmler's right-hand man, and after Himmler's death was elected Führer and Chancellor by the Committee of Eight.
His reign was brief and disastrous. Shortly after taking office, Kaltenbrunner initiated Himmler's plan for the invasion of Poland, starting a war with the Race in which he was not supported by any other major humanpower. Though Germany inflicted significant damage on the Race Colonies on Tosev 3, it never had a chance. Kaltenbrunner himself was killed in the war, and the hierarchy of the Nazi Party was destroyed. Kaltenbrunner was succeeded by Walter Dornberger, the only senior German official left, who immediately sued for peace.