In 1912, he started studying medicine at the University of Freiburg, albeit his classes were interrupted by World War I.

He was responsible for initiating mass killing by lethal injection to the heart of handicapped and sick prisoners.

Under his supervision approximately 900 Russian, Polish and Czech prisoners were murdered by lethal injections of gasoline and phenol.

If a Jewish inmate was lying on the floor with a broken limb - a not uncommon occurrence at work - he was usually thrown over a wall by a kapo.

The reason for his transfer is believed to be his shooting of Josef Breitenfellner, a vacationing German soldier, who awoke Krebsbach from his sleep on 22 May 1943.

[2] While at Kaiserwald, Krebsbach conducted selections of camp inmates for execution, by forcing the prisoners to perform physical exercises to determine their strength and then identifying the 2000 weakest to be killed.

[3] Following the camp's closure, Krebsbach resumed a career as “Epidemic Inspector for Latvia, Estonia and Lithuania”.

However this was short lived and at the end of 1944 he left the army and worked once again as a company doctor in a spinning mill in Kassel.

The following is from the court record of the Dachau trials (quoted in Hans Maršálek, "Die Geschichte des Konzentrationslagers Mauthausen", p. 174): Krebsbach: When I started work I was ordered by the head of Office III D to kill or have killed all those who were unable to work, and the incurably sick.