 He achieved national status as an authority on employment and commercial law in Ireland, co-authoring the first academic textbook on Irish employment law.He is also an expert on European Union matters and on competition (antitrust) policy.From 1991 to 2000 von Prondzynski was Professor of Law in the University of Hull; for much of that time he was also a Dean – first of the School of Law, and latterly of the whole Faculty of Social Sciences.