Hermann Maria Stoeckle, born in Bayreuth in 1888, had been Rector of the Campo Santo Teutonico since 1931 and on 2 November 1937 also took over the management of the RIGG as acting Director, while Johann Peter Kirsch was still Director off duty until 1941. Under Stoeckle, the Institute was able to survive the war and the post-war period. He resigned from the directorship on 4 October 1949.

After grammar school in Augsburg (St. Stephan's Benedictine School) and studies in theology and law in Munich, Stoeckle was ordained a priest for the Archdiocese of Munich-Freising on 29 June 1912. In 1931, Stoeckle was appointed rector of the Campo Santo Teutonico as Emmerich David's successor and held this office until 1954. His rectorship was marked by economic and academic concerns for the priests' college, which was seriously endangered as a result of the political situation in Germany (foreign exchange regulations, studies abroad). During the difficult time of the Roman occupation by German troops, he granted refuge in the Campo Santo to many politically endangered persons. In 1954 he was appointed canon of St Peter's. Stoeckle was of noble kindness, cautious, almost scrupulous, and remained without initiative as director of the RIGG, which was not dissolved by the Nazi Socialists. He resigned his post of his own accord.

His grave is on the Campo Santo Teutonico (Rector's Crypt).