He was sent to Auschwitz concentration camp where he was forced to help the SS doctor Carl Clauberg in his sterilisation experiments on Jewish women.

[3][8] There, he worked among a number of Nazi physicians including Josef Mengele, Eduard Wirths, and Friedrich Entress.

[1] In addition, he was forced to assist SS physician Carl Clauberg in sterilisation experiments on Jewish women.

In December 1945, he sent a deposition to the British war crimes authorities about the atrocities he witnessed at Auschwitz which was subsequently used at the Nuremberg Trials.

[1] He signed on as a ship's doctor again[2] and worked for the British Colonial Medical Service in Ceylon (now Sri Lanka) and then in Ghana, where in 1957 he died of Hodgkin's lymphoma in Accra.