Socialist state
On 11 November 1933 Pfannenstiel signed the commitment of the professors at German universities and colleges to Hitler and the National Socialist state. Also in 1933, he founded a chapter of the "German Society for Racial Hygiene" in Marburg. In 1934, he joined the SS. Pfannenstiel had five children. One of them was the later professor of medicine and thyroid expert Peter Pfannenstiel .