Johann Paul Kremer (26 December 1883 – 8 January 1965) was a professor of anatomy and human genetics at Münster University who joined the Wehrmacht on May 20, 1941. He served in the SS in the Auschwitz concentration camp as a physician during World War II, from 30 August 1942 to 18 November 1942.
A member of the NSDAP, he was involved in Nazi human experimentation on the prisoners of Auschwitz-Birkenau. He was sentenced to death in the Auschwitz Trial, but this sentence was later commuted to one of life imprisonment. He was released in 1958.
Kremer received notoriety for his diary, which recounted mundane day to day activities interspersed with entries of his witnessing murder and depravity through gassings and special actions.
September 5, 1942 : In the morning attended a special action from the women's concentration camp (Muslims); the most dreadful of horrors. Obersturmführer Thilo (troop doctor) was right when he said to me that this is the anus mundi. In the evening towards 8:00 attended another special action from Holland [sic]. Because of the special rations they get a fifth of a liter of schnapps, 5 cigarettes, 100 g salami and bread, the men all clamor to take part in such actions. Today and tomorrow (Sunday) work.
Kremer was born in Stellberg. He was a doctor of medicine as well as philosophy he also studied natural science and mathematics. He studied in Heidelberg, Strassburg as well as Berlin; he received his medical degree in 1919 and his philosophy degree in 1914. He was the "assistant surgeon at the surgical clinic of the University, Charité, the ward of internal diseases of the Municipal Hospital Berlin-Neukölln, the surgical clinic of the University of Cologne and prosector in the Institutes of Anatomy in Bonn and Münster. He became Dozent of anatomy in 1929 and was promoted there in 1936 to be professor in commission. At the same time he was commissioned to lecture on the science of human hereditariness [now known as the field of human genetics]." He also did some writing, he mentions two articles that he wrote in the diary he kept, the first being "Inherited or Acquired? A Noteworthy Contribution to the Problem of Hereditariness of Traumatic Deformations" and the second titled "New Elements of Cell and Tissues Investigations".