Mr. Gyselen joined Arnold & Porter after a long career in government, primarily at the European Commission. His competition law practice encompasses advice and representation before EU and national agencies on merger control, abusive conduct, cartels, other restrictive practices, and state aids.

Government Experience

Prior to joining the firm, Mr. Gyselen held several senior positions at the European Commission's Directorate-General for Competition (DG COMP). As Head of Unit, he played a key role in many high-profile cartel and abuse cases, in particular in the sectors of banking, insurance, food, and pharmaceuticals. Prior to that, as special assistant to the Director-General in DG COMP, he oversaw the entire range of EU competition enforcement policy activities, including the introduction of EC merger control, and acted as liaison officer between DG COMP and the Commissioner in charge of competition policy and his personal staff.

In the earlier years of his career, Mr. Gyselen was a member of the European Commission's Legal Service and a law clerk at the European Court of Justice in Luxembourg where he clerked for Judge Joliet.

Mr. Gyselen is involved in EC competition cases "across the board" (i.e., mergers, antitrust, and state aids). He also represents a number of international clients in antitrust cases pending before the Belgian competition authority. Since 2008, Mr. Gyselen is a Non-Governmental Advisor (NGA) to the EC. In that capacity, he has spoken at annual conferences or workshops organized by the International Competition Network (ICN).


  • Sea-Invest/EMO-EKOM: handling the notification of Sea-Invest's acquisition of a controlling minority share in EMO-EKOM, the largest stevedoring terminal for coal and iron ore in Europe (unconditional clearance in Aug. 2006 by the European Commission after an extended second phase investigation).
  • Boston Scientific Company (BSC)/Guidant: assisting in the notification of BSC's acquisition of Guidant (conditional clearance in April 2006 by the European Commission after an extended first phase examination).
  • Intel/McAfee: acting as counsel to Intel in connection with its purchase of security software firm MCafee for US$7.68 billion. The transaction was cleared without a second request in the US in December 2010 and with Phase I commitments in the European Union in January 2011.


Legal 500 Europe 2016, Belgium Competition - EU and global
Chambers Global: The World's Leading Lawyers for Business 2011-2016 for Competition/European Law (Belgium)
Chambers Europe: Europe's Leading Lawyers for Business 2014-2015 for Competition/European Law (Belgium)


  • LLM, Harvard Law School, 1983
  • LLM, College of Europe, 1979
  • LLB, University of Leuven (KUL), Belgium, 1978, magna cum laude
  • Bachelor Degree, Philosophy, University of Leuven (KUL), Belgium, 1978, magna cum laude
  • Brussels, Belgium
Government and Military Service
  • Senior Official, Directorate-General for Competition, European Commission
  • Dutch
  • English
  • French

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