Short answers, pulled from the story.
Heinrich Himmler was a German Nazi politician and military leader who served as the 4th Reichsführer of the SS from 1929 to 1945. He was one of the most powerful figures in Nazi Germany and one of the main architects of the Holocaust.
Heinrich Himmler was a principal enforcer of Nazi racial policies, responsible for operating concentration and extermination camps and for forming the Einsatzgruppen death squads. He played a central role in the genocide of an estimated 5.5 to 6 million Jews, and at the Wannsee meeting on the 20th of January 1942 Hitler placed him in charge of the plan.
Heinrich Himmler grew the SS from about 290 men to about 3,000 within a year of taking command, and to 52,000 members by 1933. He vetted applicants for Nordic qualities, imposed a marriage order requiring proof of Aryan descent back to 1800, and built an elaborate bureaucracy of SS departments.
Heinrich Himmler died on the 23rd of May 1945 by suicide in British custody near Lüneburg. He bit into a hidden potassium cyanide pill during a medical exam and was dead within 15 minutes, and his body was buried in an unmarked grave whose location remains unknown.
Hitler turned against Heinrich Himmler after learning he had tried to open peace talks with the western Allies in March 1945, news of which was broadcast over the radio on the 28th of April. Hitler, who had called him der treue Heinrich, the loyal Heinrich, dismissed him from all his posts, ordered his arrest, and expelled him from the Nazi Party in his last will and testament.
Heinrich Himmler abandoned Catholicism and treated Germanic mythology reinforced by occult ideas as a religion. He declared in 1937 that the SS lived in an era of ultimate conflict with Christianity, founded the pseudoscientific Ahnenerbe society in 1935, and introduced SS naming ceremonies and solstice celebrations to replace Christian rites.
Heinrich Himmler was born in Munich on the 7th of October 1900 into a conservative middle-class Catholic family. He was a studious but socially awkward schoolboy with lifelong stomach complaints, kept a diary from the age of 10, and studied agriculture at the Technische Hochschule München from 1919 to 1922.