 During 1897–1908 he taught at the Protestant faculty of theology in Vienna, during 1908–1913 at the University of Rostock, during 1913–1921 in Kiel and in 1921–1935 in Berlin.Sellin was Old Testament scholar and a pioneer of application of archaeology into Biblical sciences.With his excavations in Ta'anakh he initiated and led one of the first excavations of a ″tell″ in Palestine/Land of Israel (there he also found cuneiform tablets from about the 15th cent.