Dieter Janßen

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.

Robert John is a top attorney recognized by Best Lawyers in the practice area(s) of Private Equity Law. Robert, who practices law in Aurich, Germany, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Robert is held by other top lawyers in the same geographic and legal practice area.

Thomas Stein specialises in IP law, the German Act Against Unfair Competition, distribution law, and general contract law, advising and representing clients both in and out of court. His clients include clothing, beauty, and sporting goods companies, as well as brand licensors and licensees from the consumer goods, lifestyle, and luxury sectors. He also advises franchise companies, logistics firms, event companies, musicians, influencers, actors, athletes, and fashion designers. Thomas is bas...

Born in Hamburg in 1963, Jan Dietze studied law in Passau and at King’s College in London, UK, where he obtained his Diploma of Legal Studies. He also studied in Freiburg and at Europa-Kolleg in Bruges, Belgium, where he obtained the Diplôme D’Hautes Études Européennes. Jan Dietze has been a lawyer at ZENK since 1995. His practice focuses on corporate and commercial law and M&A. He also specializes in antitrust law and compliance. Mr. Dietze is a member of ...

Thomas Helmut Fischer is a top attorney recognized by Best Lawyers in the practice area(s) of Information Technology Law and Intellectual Property Law. Thomas Helmut, who practices law in Frankfurt/Main, Germany, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Thomas Helmut is held by other top lawyers in the same geographic and legal practice area.

Dr. Ute Jasper has been a lawyer at Heuking Kühn Lüer Wojtek since 1991 and a Partner since 1994. Dr. Jasper heads the Public Sector Department. With the department, she has designed and implemented numerous projects for the government as well as for large cities, counties and municipalities, such as large procurement procedures and investor competitions, but also strategic partnerships and PPPs in the fields of public transport, culture, sports, water, energy, construction, hospita...

Dr. Oliver Decker heads the inter-office Financial Services Legal division as a Partner. As well-known expert in the market, he advises on all aspects of regulatory and investment law as well as structuring, particularly regarding direct and indirect investments in alternative investment funds for institutional investors with a focus on asset managers, capital management companies, insurance companies and pension funds. In addition, Dr. Decker advises on the restructuring and liquidation of f...

Aldo Trentinaglia, born in Munich in 1982, completed basic studies in philosophy, logic and philosophy of science at the Ludwig Maximilian University in Munich on a scholarship from the Friedrich Ebert Foundation. Later followed law studies at the Bucerius Law School in Hamburg with a stay abroad in Sydney, Australia, as a scholarship holder of the German National Academic Foundation. He completed his legal clerkship at the Hanseatic Higher Regional Court. While working he completed his train...

Fabian Winters is a top attorney recognized by Best Lawyers in the practice area(s) of Public Law and Public Private Partnership. Fabian, who practices law in Berlin, Germany, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Fabian is held by other top lawyers in the same geographic and legal practice area.

Rupert Vogel is a top attorney recognized by Best Lawyers in the practice area(s) of Information Technology Law and Intellectual Property Law. Rupert, who practices law in Karlsruhe, Germany, has been recognized since 2009. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Rupert is held by other top lawyers in the same geographic and legal practice area.