[1] In 1839 he became privatdozent at Kiel, and in 1842 professor-extraordinary of archaeology and philology at the University of Greifswald (ordinary professor 1845).
[2] In 1847 he accepted the chair of archaeology at Leipzig, however, he along with Theodor Mommsen (1817–1903) and Moritz Haupt (1808–1874) were dismissed from the university in 1851 for having taken part in the political movements of 1848-1849.
[1] In 1855 he was appointed professor of the science of antiquity, and director of the academic art museum at Bonn.
[4] Jahn's work is admired for its scholarly approach (at the time, novel in Mozart biography); and in versions revised by Hermann Abert and Cliff Eisen, continues in use today.
[5] Among Jahn's notable students was the classical archaeologist and philologist Hugo Blümner.