 The Margrave of Baden withholding his consent to Dereser's acceptance of the office of coadjutor to the Bishop of Strasbourg, Dereser was transferred with the whole university to Freiburg (1807), but having given offence by a funeral sermon (1810) had to leave suddenly to Karlsruhe where he was a pastor, and then to Constance.Thence he went to Lucerne where from 1811 to 1814 he was Rector of the Episcopal Seminary, but was expelled on account of his rationalistic teaching, which involved explaining away everything supernatural in Scripture and religion.He turned, on invitation, to Breslau as canon and professor of Dogmatic Theology (1815).