Comprised of Alexander's saved records of his own department and the neurosurgical service. Contains travel documents and orders from WWII, research and investigative reports related neurosurgery, reports and correspondence related to Nazi medical experiments, patient records, correspondence, trial records and transcripts, test results, and photographs. Of special significance is material dealing with Alexander's later work as an investigator and consultant to prosecutors during the Nuremberg tribunal's medical war crimes trials of Nazis from 1946 to 1947. Significant portions of records are in German. Materials date from 1926 to 1998.