教会史
Since 1878 Hauck taught church history and Christian archeology at the University of Erlangen, and in 1889 was appointed professor of church history at the University of Leipzig. His most important publication is the "Kirchengeschichte Deutschlands" ("Church history of Germany," 1887–1920), a standard reference in the field. He also edited and published the third edition of the "Schaff-Herzog Encyclopedia of Religious Knowledge".