Michael Jakobi

Helmut Balthasar is a lawyer recognized by Best Lawyers in the practice area of Restructuring and Insolvency Law. Helmut practices law in Cologne, Germany Best Lawyers has recognized Helmut Balthasar since 2010. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Helmut Balthasar is held by other lawyers.

Dr Michael Körner has been working as a lawyer in our Cologne office since 2018 and was appointed partner on January 1, 2026. He primarily advises clients in the areas of environmental law, public procurement law, public commercial law, surveying and cadastral law, and the law governing publicly appointed surveyors, in particular partnership law. He also advises on liability law, state liability and compensation law, and litigation. He speaks German and English.

Rainer Birke is a lawyer recognized by Best Lawyers in the practice areas of Corporate Governance and Compliance Practice and Criminal Defense. Rainer practices law in Düsseldorf, Germany Best Lawyers has recognized Rainer Birke since 2021. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Rainer Birke is held by other lawyers.

Jan Janßen is a lawyer recognized by Best Lawyers in the practice area of Restructuring and Insolvency Law. Jan practices law in Hagen, Germany Best Lawyers has recognized Jan Janßen since 2021. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Jan Janßen is held by other lawyers.

Antonio Calderón is a lawyer recognized by Best Lawyers in the practice area of Mergers and Acquisitions Law. Antonio practices law in Düsseldorf, Germany Best Lawyers has recognized Antonio Calderón since 2025. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Antonio Calderón is held by other lawyers.

Markus Kappenhagen is a lawyer recognized by Best Lawyers in the practice areas of Employee Benefits Law, Labor and Employment Law and Litigation. Markus practices law in Düsseldorf, Germany Best Lawyers has recognized Markus Kappenhagen since 2016. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Markus Kappenhagen is held by other lawyers.

Dr Jan Joachim Dreyer’s work includes antitrust defence, in particular for companies with strong market positions, in sales and traditional antitrust matters, compliance issues in sales and in all forms of cooperation between competitors. His areas of expertise also include global and local merger control, including litigation over decisions by authorities reaching the German Federal Court of Justice and the European courts, claims for damages arising from antitrust violations, state ai...

Dr Karl Friedrich Dumoulin primarily advises companies on issues of national and international commercial law in their day-to-day business (supply and service agreements, cooperation and distribution agreements, questions relating to competition law and IP law, in particular trademark applications, licence agreements). Dr Dumoulin also represents his clients before courts, offices and courts of arbitration in these areas. In particular, Dr Dumoulin specialises in the field of financial servic...

Jens Kleinert practises as a lawyer and a certified tax lawyer, advising clients on all issues dealing with national and international tax law, in particular on the development of tax-optimised structures and the implementation thereof. This also comprises the development and application of capital market products, especially by using investment funds. He has broad experience in advising on complex restructurings and cross-border transactions. His focus is particularly on business succession ...

Claudia Maaßen LL.M. is a lawyer and partner at Friedrich Graf von Westphalen & Partner. She has been working in the litigation and arbitration practice group of Friedrich Graf von Westphalen’s Cologne office since 2016. Claudia Maaßen is a specialist in dispute resolution with a focus on manager liability and D&O and product liability. Her clients include insurance companies, managers and private companies. Claudia Maaßen speaks German, French and English.