He habilitated under Mommsen in Berlin in 1877 and, with the help of Mommsen, secured a post at the University of Greifswald in 1881, where he taught Roman History and Archaeology.
Ia dihabilitasikan di bawah Mommsen di Berlin pada 1877 dan, dengan bantuan Mommsen, memegang sebuah jabatan di Universitas Greifswald pada 1881, dimana ia mengajar Arkeologi dan Sejarah Romawi.