[4][5] By this time Voss had become a convinced follower of the Nazi Weltanschauung, with his diaries revealing a strong current of anti-Semitism and anti-communism.
[6] Whilst in this role he made a deal with the local Gestapo allowing them to use his incinerators in return for the use of some of the bodies of those executed by hanging or decapitation.
Voss also had a sideline selling the skulls and death masks of Jews and Poles, with the Naturhistorisches Museum's curator Josef Wastl being his leading customer for this particular service.
[7] Along with colleagues such as Robert Herrlinger Voss undertook preparation work for this trade as soon as the victims had been killed.
They had one son Hermann junior in November 1919, who demonstrated highly advanced intelligence from an early age but who also suffered from severe physical disabilities.