In 1842 he was "Privatdozent" in the University of Berlin, and in 1843 he was called to become professor of church history and Biblical literature in the German Reformed Theological Seminary of Mercersburg, Pennsylvania, then the only seminary of that church in America.
In 1842 he was "Privatdozent" in the University of Berlin, where he lectured on exegesis and church history. In 1843 he was called to become professor of church history and Biblical literature in the German Reformed Theological Seminary of Mercersburg, Pennsylvania, then the only seminary of that church in America.