Prior to joining the German bar, Klaus obtained his qualification as master mariner and as shipping business engineer. Klaus advises and represents clients on the entire range of shipping issues that arise, with a focus on casualty work and complex bill of lading and limitation of liability issues. He is the current co-chairman of the German Maritime Association and the author of a very substantial number of in-depth articles and books on German maritime law. He was heavily involved in the reform of German maritime law which came into force in April 2013. He regularly lectures on maritime law at the University of Hamburg and is the author of the expected new edition of the most prestigious textbook on German maritime law. He is the co-editor of one of the main German journals on maritime and transport law.