René Kieselmann

Lawyer Partner

Florian Dupuy, LL.M. is a top attorney recognized by Best Lawyers in the practice area(s) of Arbitration and Mediation and International Arbitration. Florian, who practices law in Berlin, Germany, has been recognized since 2027. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Florian is held by other top lawyers in the same geographic and legal practice area.

Antje Baumbach is Partner at BEITEN BURKHARDT's Berlin office and member of the Corporate / M&A practice group. Her area of expertise comprises advice on energy law and the energy industry. She advises her clients with a particular focus on energy law, including regulatory issues, as well as antitrust and competition law. She also has extensive experience in contract law and the law on standard terms and conditions. She represents our clients' interests in contract negotiations, before re...

Henrik Armah is a shareholder and Co-Chair of the German Corporate/M&A Group. He advises international and domestic clients on M&A transactions, joint ventures and corporate transformations as well as all general matters of corporate law. He specializes in cross border transactions (buy side and sell side). Henrik’s clients include industry players as well as private equity funds, strategic investors and venture capitalists. As a recognized and highly experienced lawyer in the t...

Dr. Oliver Fleischmann advises clients in various industries, in particular regulated industries, on German and European competition and merger control law, as well as German and international foreign direct investment control law. Dr. Fleischmann has represented clients in numerous merger control proceedings and governmental investigations before the European Commission, the German Federal Cartel Office and the German Ministry of Economic Affairs. He has extensive experience in advising in t...

Christiane Huismans, born in 1966 in Telgte (Westphalia), studied law in Münster following her banking apprenticeship in Bremen and has been working as a lawyer since 1996. Since 2017, she has been offering support in conflict situations as a mediator. Christiane Huismans is a partner at ZENK.* Due to her many years of experience as a lawyer in insolvency administrator law firms, on the side of intensive support of the credit industry as well as in large international law firms, Christia...

Born in Duisburg in 1974, Dr. Kostja von Keitz studied law in Düsseldorf. He received his doctorate in European nature conservation and national administrative procedural law in 2005, with a thesis on the subject of “The Legal Protection of Private Individuals against Special Areas of Conservation”. He began his career as a lawyer in 2005, working initially for a major international law firm. He became a specialist in administrative law 2008 and joined ZENK in 2009. He has be...

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...

Oliver Markmann is as a Shareholder within the German Private Equity/M&A team, where he focuses on representing a diverse range of private equity and growth equity clients in various private M&A transactions. His work spans buyouts, minority investments, co-investments, equity rollovers, and joint venture structuring, primarily concentrating on the technology, business services, and healthcare & life sciences sectors. Besides his professional commitments, Oliver values the opportu...

Uwe Bärenz is a partner at POELLATH in Berlin. He focuses on private investment funds, GP and investors advice. He is predominantly engaged in private equity funds, including cross-border work, mainly Luxembourg, tax and regulatory issues, filings, terms and conditions, private and public placements, investors' needs (pension funds, insurance companies, investment funds, fund of funds, private clients), complex secondary transactions. He is one of the most experienced advisors for the es...