on 22 August 1927. Professor and theologian In 1929, de Lubac was appointed professor of fundamental theology at the Catholic University of Lyon (the required doctorate having been conferred by the Gregorian University in Rome at the behest of the Father General of the Society of Jesus, without de Lubac's setting foot there or ever submitting a dissertation). He would teach there from 1929 to 1961, though with two interruptions – first during World War II, when he was forced underground because of his activities with the French Resistance, and then from 1950 to 1958, when the Society of Jesus, under pressure from Rome, removed him from his teaching responsibilities and the Fourvière Jesuit residence. During the 1930s de Lubac spent his time teaching at the Catholic University and researching, as well as teaching (between 1935 and 1940) one course at the Jesuit seminary at Fourvière (where he also lived from 1934 onwards). His first book, the now-classic Catholicisme (English title of the current edition: Catholicism: Christ and Common Destiny of Man) was published in 1938, before the war. In 1940, he founded the series Sources Chrétiennes ("Christian Sources"), co-edited with fellow Jesuit Jean Daniélou, a collection of bilingual, critical editions of early Christian texts and of the Church Fathers that has reinvigorated both the study of patristics and the doctrine of Sacred Tradition. During the Second World War, the first interruption to this pattern came: de Lubac joined a movement of "spiritual resistance," assisting in the publication of an underground journal of Nazi resistance called , or Christian Testimony. It was intended to show the incompatibility of Christian belief with the philosophy and activities of the Nazi regime, both in Germany and also under the cover of the Vichy government in southern France, which was theoretically independent of the Reich. De Lubac was often in hiding from the Germans and several of his co-workers on the journal were captured and executed. Even in hiding, he continued to study and write. From 1944 onwards, with the end of the Nazi occupation of France, de Lubac came out of hiding and published a number of texts (many of them begun or completed before the war but not published in the early 1940s because of the shortage of paper) which became major interventions in twentieth-century Catholic theology. These included: Corpus Mysticum, which had been ready for publication in 1939, and appeared in