In 2000 he was appointed honorary professor of industrial property law. He principally advises clients on issues of trademark law, international safeguarding of corporate goodwill, strategic optimisation of corporate brand launches as well as conducting litigation. He is author of the standard German work on the law of trade marks and sign protection entitled “Marken- und Kennzeichenrecht”. He is also the editor and co-author of “Internationales Handbuch des Marken- und Kennzeichenrechts”. This also appeared in the English language under the title “International Trade Mark and Sign Protection: A handbook”.