 He was professor in Canon Law and German Law at the University of Freiburg im Breisgau 1870 to 1872, and at the University of Strasbourg from 1872 to 1887, and was appointed Rector in 1882.From 1887 until his death in 1917 he was professor of Canon Law and German Law in the Faculty of Law at the University of Leipzig.In 1892 he published the first volume of his great work "Kirchenrecht" ("Canon Law").