Career
He was the brother of the bacteriologist Karl Bernhard Lehmann. In Zurich he first went to the private school Beust"sche Privatschule and then to the Gymnasium. In 1900 Lehmann left Switzerland and moved to Germany, where he bought the medical journal "Münchener Medizinische Wochenschrift" (ie "Munich Medical Weekly Magazine"), which he soon managed to make the most widely circulated journal of its kind in Germany.
He established the Deutsche Volksverlag, which he handed over to Ernst Boepple.
Lehmann also published the journal Deutschlands Erneuerung (Germany"s Renewal), which was edited by the Pan-German League. Lehmann"s publishing house was an important connection between the German Nationalist Protection and Defiance Federation, the Marinebrigade Ehrhardt, then the Organisation Consul and the German National People"s Party.
In 1923 Lehmann took part in the Beer Hall Putsch. In 1934, at his 70th birthday, he received many honors - e.g. the Eagle Shield of the German Reich.