Oliver Sieg

Antje Weiss is a lawyer recognized by Best Lawyers in the practice area of Public Law. Antje practices law in Düsseldorf, Germany Best Lawyers has recognized Antje Weiss since 2026. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Antje Weiss is held by other lawyers.

Herbert Posser is a lawyer recognized by Best Lawyers in the practice areas of Energy Law, Environmental Law and Public Law. Herbert practices law in Düsseldorf, Germany Best Lawyers has recognized Herbert Posser since 2009. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Herbert Posser is held by other lawyers.

Dr Michael Körner has been working as a lawyer in our Cologne office since 2018 and was appointed partner on January 1, 2026. He primarily advises clients in the areas of environmental law, public procurement law, public commercial law, surveying and cadastral law, and the law governing publicly appointed surveyors, in particular partnership law. He also advises on liability law, state liability and compensation law, and litigation. He speaks German and English.

Markus Kappenhagen is a lawyer recognized by Best Lawyers in the practice areas of Employee Benefits Law, Labor and Employment Law and Litigation. Markus practices law in Düsseldorf, Germany Best Lawyers has recognized Markus Kappenhagen since 2016. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Markus Kappenhagen is held by other lawyers.

Christian Lentföhr Attorney Certified specialist in labour law Certified specialist in commercial and corporate law Certified tax law Consultant for medium-sized companies (DASV e.V./German Association of Lawyers and Tax Consultants for the Medium-Sized Industry ) Partner Specialists areas : Labour law, c ommercial and company law, l itigation (shareholder disputes and managing director liability) My clients are primarily medium-sized companies as well as their shareholders and managing ...

Jens Klaus Fusbahn is a lawyer recognized by Best Lawyers in the practice area of Intellectual Property Law. Jens Klaus practices law in Düsseldorf, Germany Best Lawyers has recognized Jens Klaus Fusbahn since 2021. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Jens Klaus Fusbahn is held by other lawyers.

Volker Teigelkötter is a lawyer recognized by Best Lawyers in the practice areas of Employee Benefits Law and Labor and Employment Law. Volker practices law in Düsseldorf, Germany Best Lawyers has recognized Volker Teigelkötter since 2020. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Volker Teigelkötter is held by other lawyers.

Dipl.-Kfm. Dr. iur. Maximilian Koch is the Managing Director and Founder of KOCH Rechtsanwaltsgesellschaft mbH in Dusseldorf, Germany. He studied economics at the University of Hagen (Diplom-Kaufmann) and law at the University of Osnabruck (1st legal state exam with honors, ranking among the top 5% of graduates), in addition to earning his Dr. iur. "summa cum laude". After completing his legal clerkship in Lower Saxony, he excelled in the 2nd state law examination, achieving a high distinctio...

Thomas A. Beisken is a lawyer recognized by Best Lawyers in the practice area of Real Estate Law. Thomas A. practices law in Düsseldorf, Germany Best Lawyers has recognized Thomas A. Beisken since 2021. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Thomas A. Beisken is held by other lawyers.

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...