Career
Grundmann served both German dictatorships. In 1939, he was made head of the newly founded Instituts zur Erforschung jüdischen Einflusses auf das deutsche kirchliche Leben in Jena, which was meant to serve state anti-semitism by the "Entjudung" (dejudifying) of the Bible and giving anti-Semitic theological training and arguments for Nazi propaganda. Despite his past Nazi activities, Grundmann regained some prestige as an evangelic theologian in East Germany.
In 1959 he published his comments on the Gospels, which by the 1980s had become standard popular literature.
However, Grundmann also prospered as a "Secret Informer" ("Geheimer Informator") to the Ministry for State Security ("Stasi"). He spied on (high ranking) theologians in Eastern and Western Germany.
His cover name was General Motors Berg ("General Motors Mountain") after the Sermon on the Mount ("Bergrede") to which he referenced in his inaugural speech 1939 at the Institute for the Study and Elimination of Jewish Influence on German Church, set up under him in Jena. Training and theological development to 1939
Head of the Institute (1939-1945)
Post-war life.