He is also a city guide[1] and until 2012 he was a member of the board of Eschweiler Geschichtsverein (EGV) (i.e. Eschweiler Historical Society)[2] and of the Fördererverein Nothberger Burg (i.e. Nothberg Castle Sponsors' Society).
In the Esperanto movement, he has managed publications, organized international meetings, founded an Esperanto youth group in Eschweiler and taught that language inter alia at the adult high school of Düren.
He is an Esperantologist, member of Gesellschaft für Interlinguistik (GIL) (Society for Interlinguistics) and of the scientists' staff of Akademio Internacia de la Sciencoj San Marino (AIS) as well as lector for mathematics of the international Scienca Revuo.
His field of activity within Esperanto Studies includes lexicography, etymology, Esperanto offshoots (called Esperantidos) and language propaedeutics within the scope of cybernetic pedagogy.
Furthermore, he deals with Volapük, Interlingue, Interlingua, Glosa and Ido and edited an Esperantido magazine called Nova Provo (i.e. New Attempt) in the 1990s.