Rudolf Höss testified at the International Military Tribunal at Nuremberg on 15 April 1946, where he gave a detailed accounting of his crimes. He was called as a defense witness by Ernst Kaltenbrunner's lawyer, Dr. Kauffman. The transcript of Höss' testimony was later entered as evidence during the 4th Nuremberg Military Tribunal known as the Pohl Trial, named for principal defendant Oswald Pohl. Affidavits that Rudolf Höss made while imprisoned in Nuremberg were also used at the Pohl and IG Farben trials.