Malou, bishop of Bruges, in Rome in 1854 when Jungmann made his public defence of the philosophical theses, called him in September, 1861, to the chair of philosophy in the Minor Seminary, Roeselare.
His appointment to the chair of ecclesiastical history at Leuven University, in succession to G. Henry Wouters, opened in 1871 a wider field for his great ability.
A keen intellect with powers of clear exposition, joined to the spirited delivery which distinguished his lectures, ensured him great success.
He enlarged the field of ecclesiastico-historical studies by delivering special lectures on patrology, and establishing in 1890 a seminary for ecclesiastical history, in which students were to receive a scientific and methodical training in original historical research.
(1867); "Clemens V. und die Aufhebung des Templerordens" in the Zeitschrift für katholische Theologie (Innsbruck, 1881); "Le caractère moral de Luther" in "La Controverse" (1883).