ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti nˈaɪn, hiː wʌz ɐpˈɔɪntᵻd ɐ fˈʊl pɹəfˈɛsɚɹ ʌv hˈɪstɚɹi æt ðə pˌɑːlɪtˈɛknɪk skˈuːl ɪn mjˈuːnɪk, ænd ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd ˈeɪɾi θɹˈiː hiː ɹᵻtˈɜːnd tə ɡˈɜːtɪndʒən æz ɐ səksˈɛsɚ tə hɪstˈoːɹiən ɹˈaɪnhoʊld pˈɔːli.
In 1869, he was appointed a full professor of history at the Polytechnic School in Munich, and in 1883 he returned to Göttingen as a successor to historian Reinhold Pauli.