Jan T. Tenner

Dr Jan Joachim Dreyer’s work includes antitrust defence, in particular for companies with strong market positions, in sales and traditional antitrust matters, compliance issues in sales and in all forms of cooperation between competitors. His areas of expertise also include global and local merger control, including litigation over decisions by authorities reaching the German Federal Court of Justice and the European courts, claims for damages arising from antitrust violations, state ai...

Marc Oberhardt is a top attorney recognized by Best Lawyers in the practice area(s) of Restructuring and Insolvency Law. Marc, who practices law in Düsseldorf, Germany, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Marc is held by other top lawyers in the same geographic and legal practice area.

Lawyer and Mediator Partner

Lutz Martin Keppeler is a top attorney recognized by Best Lawyers in the practice area(s) of Data Security and Privacy Law and Information Technology Law. Lutz Martin, who practices law in Cologne, Germany, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Lutz Martin is held by other top lawyers in the same geographic and legal practice area.

Lawyer Partner

Martin Wirtz works in all fields of intellectual property matters, with a particular emphasis on trade mark, competition, and copyright law, including litigation. A further focus of his work is patent infringement proceedings. His clients include large and medium-sized firms as well as international companies and associations from a wide variety of different areas. Martin Wirtz studied law at the University of Passau, the University of Freiburg, the University of Cologne, and at Queens' Colle...

Thomas Kerkhoff is partner in our Düsseldorf office. For many years he has been advising clients on intellectual property law. His work includes advice on trademarks, their protection and their realisation. In cooperation with accountants and business economists he is regularly involved in the taxational assessment of trademarks. His work also includes all aspects of copyright protection, designs and unfair trading. He also does litigation in cases of intellectual property infringements ...

Holger Weiß is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law and Real Estate Law. Holger, who practices law in Düsseldorf, Germany, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Holger is held by other top lawyers in the same geographic and legal practice area.

Michael Schaumann is a top attorney recognized by Best Lawyers in the practice area(s) of Mergers and Acquisitions Law. Michael, who practices law in Cologne, Germany, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Michael is held by other top lawyers in the same geographic and legal practice area.

Jörn Zons is a lawyer and partner at Friedrich Graf von Westphalen & Partner in Cologne. Jörn’s main focus lies on German and international construction and engineering projects as well as domestic and international dispute resolution in litigation, arbitration and alternative dispute resolution proceedings. He is also a regular referee on German and international construction and engineering projects and dispute resolution at seminars, associations and in-house for compan...