Preu Bohlig & Partner focuses on national and international patent litigation across sectors including chemistry, biotechnology, nano-technology and automotive. Peter Kather, who has headed the Düsseldorf practice since it was established in 1998, is thought to be one of the firm's key figures. One competitor says "Peter is one of the best and has a good standing with clients in Düsseldorf". The firm has represented high-profile clients including Porsche, GM Europe (Opel), Siemens and Continental. Christian Donle, head of the Berlin office, advised Agency Fotofinder/Ostkreuz in a landmark proceeding for journalism and the media industry. The work related to proceedings against Stiftung Preußische Schlösser und Gärten Berlin-Brandenburg (SPSG) in connection with the rights to photos of castles and monuments. Other work has involved advising clients such as Continental and Leica Microsystems in relation to patent infringement proceedings, advice on licensing and other patent matters.