ZENK Rechtsanwälte Partnerschaft mbB is an independent, full service commercial law firm with approx. 50 lawyers, a notary office, a mediation practice and a tax consulting service at its offices in Hamburg and Berlin. It advises on national and international projects in all core areas of commercial law. Our clients include medium-sized German companies, international corporations and public institutions at federal, state and local levels.


ZENK was founded in Hamburg at the beginning of the 1970s. At present, approximately 30 lawyers and a tax consultant advise clients at the Hamburg office on Neuer Wall.


During the reunification of Germany in 1991, the Berlin branch was opened in the government district to establish a presence in the newly emerging political and cultural metropolis.
At present, the Berlin office at Reinhardtstraße has approximately 20 lawyers. It also has its own notary office led by three notaries.


ZENK lawyers have been listed and awarded as leading advisors in the German legal market for years in numerous renowned rankings in the various fields of law. These rankings are based on surveys of leading media among legal colleagues (peer-to-peer reviews) and other market participants such as clients.

Best Lawyers / Handelsblatt

Exclusively for the German Handelsblatt and based on an extensive peer-to-peer survey, US publisher Best Lawyers identifies every year the leading advisors in the German legal market. The lawyers are nominated by colleagues and market participants and then evaluated in an anonymous survey. The ranking is also published exclusively in the Handelsblatt as Germany’s Best Lawyers”.

ZENK is pleased about the recognition of the following heads as “Germany’s Best Lawyers 2023”:

In Employment Law, Dr. Markus Kelber and Dr. Rolf Zeißig were again honored.

In Construction Law, Alexander Baden was honored for the sixteenth year in a row, and Dr. Peer Feldhahn, Anja Teiwes, and Florian Werner, Dipl.-Ing. (FH) were honored again.

In Energy Law, Dr. Ralf Hüting was honored for the first time. In Mergers and Acquisitions (M&A), Jan Dietze received an award.

In Intellectual Property Law, Dr. Christian Freudenberg, Dr. Stefanie Hartwig and Dr. Lisa Feuerhake were repeatedly honored.

In Real Estate Law, Alexander Baden, Dr. Oliver Nowoczyn, Dr. Henrik Nacke, Victoria-Luise Vollstedt, LL. M. and Birgitta Weihrich were honored.

In Public Commercial Law, Dr. Kostja von Keitz was honored. In Tax Law, Christopher J. Wright was honored.

In Environmental Law, Dr. Wolfgang Hopp, Dr. Ralf Hüting, Dr. Kostja von Keitz and Dr. Martin Düwel were honored.

For the fifteenth consecutive year Dr. Carsten Oelrichswas honored in Advertising Law as well as for Food Law and Health Law.

Sonja Schulz, LL. M. was honored for Advertising Law.

JUVE Legal Directory

JUVE Handbuch Wirtschaftskanzleien is a reference work of the German legal market. The publication is based on extensive research carried out by an independent editorial team among law firms, corporate managers, representatives of public authorities and employees of the judiciary and academia.

The 2023/2024 handbook makes special mention of: Dr. Carsten Oelrichs (‘professionally and personally convincing,’ client); Dr. Stefanie Hartwig (‘looks beyond the horizon,’ competitor, ‘very knowledgeable in trademark and copyright law,’ competitor); Alexander Baden (‘very competent and client-oriented,’ client; ‘very experienced, also pragmatic and straightforward,’ client); Dr. Henrik Nacke (‘level-headed and collegial negotiator,’ client); Dr. Christian Freudenberg (‘very cooperative despite tough dispute,’ competitor)

Legal 500 Guide for Germany

“The Legal 500 (Germany)” is a detailed qualitative review of law firms and lawyers in 48 specialist areas and is used as a reference by professionals and clients. Every year, the editorial staff interviews hundreds of lawyers and records around 14,000 client references.

In the 2023 survey, ZENK was listed in the rankings for the Hamburg metropolitan region and the Brandenburg/Berlin metropolitan region with special mention of Dr. Michael Hackert as well as Dr. Martin Düwel and Dr. Kostja von Keitz.

The trademark and competition law expertise of the team led by Dr. Stefanie Hartwig, Dr. Carsten Oelrichs and Sonja Schulz was also acknowledged.

FOCUS Magazine

Also for the seventh year in a row, the Construction Law Department at ZENK was listed as a recommended commercial law practice by the FOCUS editorial team in their special edition on “Germany’s Top Lawyers 2022”. The list is categorised into 24 specialist areas of law. The Germany-wide ranking is based on recommendations from peers and surveys of legal departments in companies.