Answer
Heinrich Himmler appointed Walter Schellenberg as head of foreign intelligence in 1941, after Reinhard Heydrich was killed by partisans in Czechoslovakia. Schellenberg oversaw the expansion of the Sicherheitsdienst (SD) and the creation of the Amt Ausland/Abwehr, which became the primary German foreign intelligence agency. Schellenberg was also responsible for negotiating with foreign powers, including the United States and the Soviet Union.