A bibliographer, born at Grossglogau; after a college career at Halle devoted himself to journalism, and in 1800 became librarian of the University of Jena; subsequently filled the chair of Geography and Statistics at Halle; his "Handbook of German Literature" marks the beginning of German bibliography; began in 1818, along with Gruber, the publication of an encyclopædia which is still unfinished (1766-1828).