Question: Who conducted the negotiations with the owners and the longest serving commandant of Auschwitz concentration and extermination camp?

Documents:
source: Gerstein Report
text: Gerstein Report The Gerstein Report was written in 1945 by Kurt Gerstein, an Obersturmführer (First Lieutenant) of the Waffen-SS who rose to become the Head of Technical Disinfection Services of the SS, and in that capacity supplied hydrogen cyanide (Zyklon B) from Degesch ("Deutsche Gesellschaft für Schädlingsbekämpfung") to Rudolf Höss in Auschwitz and conducted the negotiations with the owners. On 17 August 1942, together with Rolf Günther and Wilhelm Pfannenstiel, Gerstein witnessed the gassing of some 3,000 Jews in the extermination camp of Belzec in occupied Poland. The report features his eyewitness testimony. It was used as evidence in the Nuremberg Trials.

source: Rudolf Höss
text: Rudolf Höss Rudolf Höss (also Höß, Hoeß or Hoess; 25 November 1901 – 16 April 1947) was a Nazi German "SS"-"Obersturmbannführer" (lieutenant colonel) and the longest-serving commandant of Auschwitz concentration and extermination camp in World War II. He tested and carried into effect various methods to accelerate Hitler's plan to systematically exterminate the Jewish population of Nazi-occupied Europe, known as the "Final Solution". On the initiative of one of his subordinates, SS-"Hauptsturmführer" (captain) Karl Fritzsch, Höss introduced pesticide Zyklon B containing hydrogen cyanide to the killing process, thereby allowing SS soldiers at Auschwitz to murder 2,000 people every hour. He created the largest installation for the continuous annihilation of human beings ever known.

source: Birkenau (disambiguation)
text: Birkenau (disambiguation) Birkenau commonly refers to the Nazi German extermination camp Auschwitz II–Birkenau in the Auschwitz concentration camp during World War II, located near Brzezinka, Poland.

source: Auschwitz concentration camp
text: Auschwitz concentration camp Auschwitz concentration camp (German: "Konzentrationslager Auschwitz" , ] , also "KZ Auschwitz " or "KL Auschwitz ") was a network of German Nazi concentration camps and extermination camps built and operated by the Third Reich in Polish areas annexed by Nazi Germany during World War II. It consisted of (the original camp), Auschwitz II–Birkenau (a combination concentration/extermination camp), (a labor camp to staff an IG Farben factory), and 45 satellite camps.

source: Majdanek concentration camp
text: Majdanek concentration camp Majdanek, or KL Lublin, was a German concentration and extermination camp built and operated by the SS on the outskirts of the city of Lublin during the German occupation of Poland in World War II. Although initially purposed for forced labor rather than extermination, the camp was used to kill people on an industrial scale during Operation Reinhard, the German plan to murder all Jews within their own General Government territory of Poland. The camp, which operated from October 1, 1941, until July 22, 1944, was captured nearly intact, because the rapid advance of the Soviet Red Army during "Operation Bagration" prevented the "SS" from destroying most of its infrastructure, and the inept Deputy Camp Commandant Anton Thernes failed in his task of removing incriminating evidence of war crimes. Therefore, Majdanek became the first concentration camp discovered by Allied forces. Also known to the "SS" as "Konzentrationslager Lublin", Majdanek remains the best preserved Nazi concentration camp of the Holocaust.

source: Kraków Ghetto
text: Kraków Ghetto The Kraków Ghetto was one of five major, metropolitan Jewish ghettos created by Nazi Germany in the new General Government territory during the German occupation of Poland in World War II. It was established for the purpose of exploitation, terror, and persecution of local Polish Jews, as well as the staging area for separating the "able workers" from those who would later be deemed unworthy of life. The Ghetto was liquidated between June 1942 and March 1943, with most of its inhabitants sent to their deaths at Bełżec extermination camp as well as Płaszów slave-labor camp, and Auschwitz concentration camp, 60 km rail distance.

source: Monowitz concentration camp
text: Monowitz concentration camp Monowitz (also called Monowitz-Buna or Auschwitz III) was initially established as a subcamp of Nazi Germany's Auschwitz concentration camp. It was one of the three main camps in the Auschwitz concentration camp system, with an additional 45 subcamps in the surrounding area. It was named after the village of Monowice (German: Monowitz) upon which it was built and was located in the annexed portion of Poland. The SS established the camp in October 1942 at the behest of I.G. Farben executives to provide slave labor for their Buna Werke (Buna Works) industrial complex. The name "Buna" was derived from the butadiene-based synthetic rubber and the chemical symbol for sodium (Na), a process of synthetic rubber production developed in Germany. Various other German industrial enterprises built factories with their own subcamps, such as Siemens-Schuckert's Bobrek subcamp, close to Monowitz in order to profit from the use of slave labor. The German armaments manufacturer Krupp, headed by SS member Alfried Krupp, also built their own manufacturing facilities near Monowitz.

source: Carl Clauberg
text: Carl Clauberg Carl Clauberg (28 September 1898 – 9 August 1957) was a German gynecologist who conducted medical experiments on human subjects (mainly Jewish) at Auschwitz concentration camp. He worked with Horst Schumann in X-ray sterilization experiments at Auschwitz concentration camp.

source: Jasenovac concentration camp
text: Jasenovac concentration camp The Jasenovac concentration camp (/Логор Јасеновац, ] ; Yiddish: יאסענאוואץ‎ ) was an extermination camp established in Slavonia by the authorities of the Independent State of Croatia (NDH) during World War II. The camp was established by the governing Ustaše regime and not operated by Nazi Germany. It was one of the largest concentration camps in Europe and the camp has been referred to as "the Auschwitz of the Balkans" and "the Yugoslav Auschwitz".

source: SS command of Auschwitz concentration camp
text: SS command of Auschwitz concentration camp The SS command of Auschwitz concentration camp refers to those units, commands, and agencies of the German SS which operated and administered the Auschwitz concentration camp during World War II. Due to its large size and key role in the Nazi genocide program, the Auschwitz Concentration Camp encompassed personnel from several different branches of the SS, some of which held overlapping and shared areas of responsibility.

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Answer: Rudolf Höss