Art historian (PhD thesis: James Sharples und das Zertifikat der ASE. Studien zur Bildkultur britischer Gewerkschaften / James Sharples and the membership certificate of the Amalgamated Society of Engeneers. Studies in the visual culture of British Trade Unions) and publisher, museologist. Editor of two dictionaries and books on museum documentation and fake detection. Founder and editor of the German museum magazine MUSEUM AKTUELL and the English museum magazine EXPOTIME!.