Carl M. Sieger

Kirsten Placke is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. Kirsten, who practices law in Düsseldorf, Germany, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kirsten is held by other top lawyers in the same geographic and legal practice area.

Hermann Kahlhöfer advises clients in patent law, in particular in the fields of electrical engineering, medical technology and physics. He has been working in the field of intellectual property for more than 40 years and has extensive experience in the field of national and international patent prosecution procedures and patent infringement matters as well as in the development and exploitation of intellectual property portfolios. After completing two years of military service with a spe...

Jens Biemann is a top attorney recognized by Best Lawyers in the practice area(s) of Public Law. Jens, who practices law in Düsseldorf, Germany, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jens is held by other top lawyers in the same geographic and legal practice area.

Born in 1964 Legal studies at the Universities of Heidelberg and Bonn First Exam ("1. Staatsexamen") in 1990 Doctoral research at the Universities of Valencia (Spain) and Münster Legal clerkship ("Referendariat") at the Detmold District Court Elective posting at the Commission of the European Union in Brussels Doctor of Laws (Dr. jur.) 1993 Second (Bar) Exam ("2. Staatsexamen"), bar admission 1994, with the firm since 1994 Certified Specialized Attorney in Administrative Law since 1997 C...

Ingo Klauß is a top attorney recognized by Best Lawyers in the practice area(s) of Competition / Antitrust Law. Ingo, who practices law in Düsseldorf, Germany, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ingo is held by other top lawyers in the same geographic and legal practice area.

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...

Christoph J. Müller is a top attorney recognized by Best Lawyers in the practice area(s) of Labor and Employment Law. Christoph J., 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 Christoph J. is held by other top lawyers in the same geographic and legal practice area.

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.

Born in 1970 Legal studies at Bielefeld University First Exam ("1. Staatsexamen") in 1995 Doctoral studies as a Friedrich-Naumann-Stiftung fellow, dissertation on "Kapitalsicherung und Gläubigeranfechtung" (capital protection and creditor appeals) under Prof. Dr. Schön as doctoral advisor Legal clerkship ("Referendariat") at the Bielefeld District Court Second (Bar) Exam ("2. Staatsexamen") in 1998 With the firm since 1999 Doctor of Laws (Dr. jur.) 2001 Certified Specialized Attorne...

Helmut Balthasar is a top attorney recognized by Best Lawyers in the practice area(s) of Restructuring and Insolvency Law. Helmut, who practices law in Cologne, Germany, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Helmut is held by other top lawyers in the same geographic and legal practice area.