After that, early in 1945, he found himself back in the Bodensee area, summoned to work at the massive Urlau Munitions Establishment [de], on a secret project which involved arming grenades with highly toxic battle chemicals.

After the war Friedrich Jung worked briefly in Tübingen, before taking a post, in 1946, at Würzburg University, as Acting Director of the Pharmacology Institute there.

In 1949 he moved from Würzburg to the Soviet occupation zone, taking a job at the recently established Institute for Pharmacology [de] at Buch, a suburb on the northern side of Berlin.

Part of the context for this career move came from Jung's rejection for a vacant professorship at Würzburg, where the faculty had instead selected for the promotion a former Nazi Party member.

The Soviet Administrators in the territory that in October 1949 was re-founded as the German Democratic Republic had worked hard since 1945 to attract scientists from the western occupation zones to their version of Germany, with offers of professorships and other senior positions.

His successor in charge of this expanded department was the pathologist Karl-Wolfgang Zschiesche who had been brought over to Berlin in 1979 from the Central Institute for Microbiology and Experimental Therapy [de] at Jena.

As a top expert in his field he was also drawn into the Geneva negotiations on the banning of biological and chemical weapons, and served in national and international committees concerned with peace and disarmament.

[4] Within the German Democratic Republic most of the teaching professorships in Pharmacology and a plethora of other senior posts in the academic institutes with a biomedical focus came to be occupied by former students of Friedrich Jung.