Question: Felix Martin Julius Steiner (23 May 1896 – 12 May 1966) was an "Obergruppenführer" in the Waffen-SS during World War II, who commanded several SS divisions and corps, together with which high-ranking commander in the Waffen-SS of Nazi Germany during World War II,   he contributed significantly to the development and transformation of the Waffen-SS into a military force made up of volunteers and conscripts, and who played a key role in the post-war efforts by former members of the Waffen-SS to achieve historical and legal rehabilitation?
Context: Karl Wolff (13 May 1900 – 17 July 1984) was a high-ranking member of the Nazi SS who held the rank of SS-"Obergruppenführer" in the Waffen-SS.  He became Chief of Personal Staff Reichsführer-SS (Heinrich Himmler) and SS Liaison Officer to Hitler until his replacement in 1943.  He ended World War II as the Supreme Commander of all SS forces in Italy.  In 1964, Wolff was convicted of war crimes in West Germany; he was released in 1969. Felix Martin Julius Steiner (23 May 1896 – 12 May 1966) was an "Obergruppenführer" in the Waffen-SS during World War II, who commanded several SS divisions and corps.  He was awarded the Knight's Cross of the Iron Cross with Oak Leaves and Swords.  Together with Paul Hausser, he contributed significantly to the development and transformation of the Waffen-SS into a military force made up of volunteers and conscripts from both occupied and un-occupied lands. Georg Keppler (7 May 1894 – 16 June 1966) was a high-ranking Waffen-SS commander during World War II.  He commanded the SS Division Das Reich, SS Division Totenkopf, I SS Panzer Corps, III SS Panzer Corps and the XVIII SS Army Corps. The Indian Legion (German: "Indische Legion" ), officially the Free India Legion (German: "Legion Freies Indien" ) or Infantry Regiment 950 (Indian) (German: "Infanterie-Regiment 950 (indisches), I.R. 950" ) and later the Indian Volunteer Legion of the Waffen-SS (German: "Indische Freiwilligen Legion der Waffen-SS" ), was a military unit raised during the Second World War in Nazi Germany.  Intended to serve as a liberation force for British-ruled India, it was made up of Indian prisoners of war and expatriates in Europe.  Because of its origins in the Indian independence movement, it was known also as the "Tiger Legion", and the "Azad Hind Fauj".  Initially raised as part of the German Army, it was part of the "Waffen-SS" from August 1944.  Indian independence leader Subhas Chandra Bose initiated the legion's formation, as part of his efforts to win India's independence by waging war against Britain, when he came to Berlin in 1941 seeking German aid.  The initial recruits in 1941 were volunteers from the Indian students resident in Germany at the time, and a handful of the Indian prisoners of war who had been captured during the North Africa Campaign.  It would later draw a larger number of Indian prisoners of war as volunteers. HIAG (German: "Hilfsgemeinschaft auf Gegenseitigkeit der Angehörigen der ehemaligen Waffen-SS" , literally "Mutual aid association of former Waffen-SS members") was a lobby group and a revisionist veterans' organisation founded by former high-ranking Waffen-SS personnel in West Germany in 1951.  Its main objective was to achieve legal, economic and historical rehabilitation of the Waffen-SS. Paul Hausser (7 October 1880 – 21 December 1972) was a high-ranking commander in the Waffen-SS of Nazi Germany during World War II who played a key role in the post-war efforts by former members of the Waffen-SS to achieve historical and legal rehabilitation. Karl Schümers (17 October 1905 – 18 August 1944) was a high-ranking commander in the Waffen-SS and Ordnungspolizei (police) of Nazi Germany during World War II.  He commanded the SS Polizei Division in July – August 1944.  He was directly or indirectly involved in many of the major during 1944.  Killed by a landmine on 18 August 1944, he was posthumously awarded the Knight's Cross of the Iron Cross. Friedrich-Wilhelm Bock (6 May 1897 – 11 March 1978) was a German Waffen-SS commander during World War II who led three SS divisions, the SS Division Hohenstaufen, 4th SS Polizei Division, Waffen Grenadier Division of the SS (2nd Latvian).  He was awarded the Knight's Cross of the Iron Cross of Nazi Germany. Joachim Ziegler (2 October 1904 – 2 May 1945) was a high-ranking commander in the Waffen-SS of Nazi Germany during World War II.  He was the commander of the SS Division Nordland, and was a recipient of the Knight's Cross of the Iron Cross with Oak Leaves. Herbert Otto Gille (8 March 1897 – 26 December 1966) was a high-ranking German SS commander of the Nazi era.  He commanded the SS Division Wiking during World War II.  Gille was a recipient of the Knight's Cross of the Iron Cross with Oak Leaves, Swords and Diamonds, making him the most highly decorated Waffen-SS member of the war.  After the war, Gille became active in HIAG, a lobby group and a revisionist veteran's organisation founded by former high-ranking Waffen-SS personnel in West Germany in 1951.
Answer: Paul Hausser