F. C. Baur, the leader of the new Tübingen school, was lecturing on the New Testament and on the history of the church and of dogma, and by him in particular Keim was greatly impressed.
[1] The special bent of Keim's mind is seen in his prize essay, Verhältniss der Christen in den ersten drei Jahrhunderten bis Konstantin zum römischen Reiche (1847).
In 1850 he visited the University of Bonn, where he attended some of the lectures of Friedrich Bleek, Richard Rothe, C. M. Arndt, and Isaak Dorner.
[1] In 1859 he was appointed archdeacon, but a few months later he was called to the University of Zürich as professor of theology (1859-1873), where he produced his important works.
In 1881 H. Ziegler published one of Keim's earliest works, Rom und das Christenthum, with a biographical sketch.