Oswald von Nell-Breuning SJ (
March 8,
1890 -
August 21,
1991) was a
Roman Catholic theologian and
sociologist. Born in
Trier into an aristocratic family, Nell-Breuning was ordained in
1921 and appointed Professor of Ethics at the University of
Frankfurt am Main in
1928. He was instrumental in the drafting of
Pope Pius XI's social
encyclical Quadragesimo Anno (
1931), which -- like the earlier
Rerum Novarum (
1891), after which it was named -- dealt with the "Social Question" and developed the principle of
subsidiarity. Nell-Breuning was not allowed to publish from
1936 to the end of
Nazi Germany in
1945.
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