David Zechmeister

Born in Göttingen in 1974, Dr. Stefanie Hartwig studied law in Kiel and Liège from 1994 to 1998 and completed her postgraduate studies in business law in Hamburg. Thereafter, she worked as a trainee lawyer in Hamburg and New York and as a research associate at the University of Hamburg. She completed her doctorate in 2002. Ms. Hartwig has been working as a lawyer since 2003, initially in a major international law firm and since 2005 at ZENK. Since 2007, she has also been a special...

Lawyer Associated Partner

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

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

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

Jan Erik Spangenberg specialises in dispute resolution, litigation and arbitration. He acts both as counsel and as arbitrator. He assists companies, governments and individuals in navigating complex disputes, in particular international commercial and investment arbitrations. He also advises governments and investors in relation to foreign investments and public international law. Jan Erik Spangenberg has successfully represented clients in many high stakes arbitrations (including ICC, DIS, S...

Martin has worked in litigation and arbitration for more than fifteen years. He has extensive experience in representing clients before state courts and arbitral tribunals. As an experienced litigator, Martin represents national and international clients in commercial disputes before the German regional and higher regional courts. In the field of arbitration, he has conducted proceedings as counsel under various arbitration rules (including ICC, DIS, GMAA and in ad hoc proceedings). He also r...

Born in Hamburg in 1962, Birgitta Weihrich studied law in Hamburg. After completing her legal clerkship – including a post at the Directorate-General for Competition of the European Commission in Brussels and Speyer – she was admitted to the bar in 1992. After spending a number of years in a commercial law firm in Northern Germany and as a legal advisor and authorized signatory of an insurance company, she joined ZENK in 2018. She has many years’ experience in both a wide ra...

Lawyer Partner

Dr. Jörn Bosse serves clients primarily from the corporate sector in Hamburg, with a focus on construction and real estate law. His work involves assisting companies in navigating the complexities of real estate project development. This includes obtaining necessary building permits, maintaining neighborhood relations, and overseeing construction operations. Dr. Bosse emphasises the importance of resolving disputes out of court, though he is prepared to litigate when needed. Real estate ...