 He was an expert in church history and did work as an editor for several encyclopedic books on this subject, in which he also wrote articles himself.He was the editor of the "Kirchliches Handlexikon" (1904-1912), and between 1930 and 1938, he was the editor of the "Lexikon für Theologie und Kirche", which in 10 volumes contained 8,000 articles.In both publications, he showcases "Christian" antisemitism.