Friedrich Panse
Friedrich Panse was a German psychiatrist who was involved in Aktion T4 as an advisor who "expertly guided" patients into gas chambers.
After the war, in 1948, Panse was tried, but he was acquitted. His defense that was that if he had not participated, even more patients would have died. He was then made director of the psychiatric clinic of the Medical Academy of the Rhine Hospital in Düsseldorf. In 1965 he was elected president of the German Society for Psychiatry and Neurology.