Dr. Dörries has been active in intellectual property since 1993 and is co-founder and partner of df-mp. His technical expertise inter alia spans the areas molecular biology, biotechnology, immunology, pharmaceuticals and polymer chemistry. His legal qualifications enable him to represent clients before the German Patent and Trademark Office (GPTO), the European Patent Office (EPO), the German Federal Patent Court (GFPC), the German Federal Court of Justice (FSC; in appeals from the GFPC), the Unified Patent Court (UPC) and the European Union Intellectual Property Office (EUIPO).