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Hengeler Mueller

Work +49 211 83 04 0
Fax +49 21 18 30 41 70
Berlin, Brussels, Dusseldorf, Frankfurt, London, Munich

Dr Hans-Jörg Niemeyer

Work +32 2 788 5500
Hengeler Mueller

Work Department

Competition, Antitrust; State Aid.


Hans-Jörg has worked as a lawyer in Brussels for over 20 years. He has a broad competition practice, which includes advising on European merger control, antitrust and state aid law. He represents European and other international companies in proceedings before the European Commission and the European Court of Justice.


Hans-Jörg has been partner at Hengeler Mueller since 2001. Prior to this he was partner at the Brussels office of a German law firm for almost ten years.




Universities of Heidelberg, Munich and Muenster (Dr jur).


Competition: EU and global

Within: Competition: EU and global

At Hengeler Mueller, Hans-Jörg Niemeyer and Markus Röhrig, who are the main contacts in Brussels, act for a broad base of German, European and non-European clients. Working closely with colleagues based in Germany, the duo excel in defending clients' interests in cartel investigations brought by the German Federal Cartel Office, the EC and foreign antitrust authorities. Elsewhere, the team assists clients with parallel US and European merger reviews, and also plays a key role in other global mergers. The firm has been acting for MAN SE in various follow-on actions arising from the EC's truck cartel investigation. Tata Steel, Knorr-Bremse and Carl Zeiss Vision are also active clients.

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Germany: Compliance

Internal investigations

Within: Internal investigations

Hengeler Mueller’s practice combines expertise in the areas of compliance, internal investigations and white-collar crime; it also works closely with other areas, such as criminal procedural law, corporate, antitrust, data protection and insolvency law. It is conducting internal and external investigations for the Robert Bosch group globally in connection with the alleged manipulation of nitrogen oxide emissions from diesel vehicles. In addition, Hans-Jörg Niemeyer’s team recently successfully completed the representation of Calsonic Kansei; following the EU Commission’s antitrust investigation, the firm defended claims for damages. Daniel Weiß assisted an international retail group with investigating suspected fraud. The group was strengthened at the senior associate level: Ralf Christian van Ermingen-Marbach, who has expertise in white-collar crime and internal investigations, joined from the Düsseldorf public prosecutor’s office. Dirk Uwer and Wolfgang Spoerr also deserve special mention.

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Germany: Public sector

State aid

Within: State aid

The state aid team at Hengeler Mueller frequently acts on matters touching upon public procurement and antitrust law. Jan Bonhage heads the practice group in Berlin, while Hans-Jörg Niemeyer handles state aid matters from the Brussels office. The nine-strong team’s expertise includes advising aid recipients and donors on matters relating to state aid and subsidies, and representing them before national authorities, the European Commission and European and German courts. It is particularly active in the energy and transport sectors (local public transport, road, rail and air transport). Recent highlights include representing an EU energy utility in arbitration proceedings with various municipal utilities regarding gas supply contracts. In addition, the group acted for an EU member state in an EU Commission state aid case concerning a nuclear power project. Komnexx, National Express and the Hungarian Government are also part of the client portfolio. Ralf Willer made counsel in January 2018.

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