- Member of the ICSID ad hoc Committee in Víctor Pey Casado and President Allende Foundation v. Chile (ICSID Case No. ARB/98/2), second annulment proceedings (pending).
- Counsel to the Republic of Kazakhstan in Belgian recognition and enforcement proceedings in Stati v. Kazakhstan.
- Counsel to an African State before the International Court of Justice in Legal consequences of the separation of the Chagos Archipelago from Mauritius in 1965 (Request for Advisory Opinion).
- Sole arbitrator in CEPANI commercial arbitration, Brussels.
- Counsel to the Democratic Republic of the Congo before the International Court of Justice in the Case concerning armed activities on the territory of the Congo, Congo v. Uganda, second phase (reparation) (participation discontinued).
- Counsel to the Republic of Burundi in ICSID Case No. ARB/14/31, Tareq Bashir & Interpétrol v. Republic of Burundi (pending – Mr. Jan Paulsson, President, Mr. Hamid Gharavi and Mrs. Anna Joubin-Bret, arbitrators).
- Counsel to the Minister-President of the Walloon Region of Belgium in negotiations towards the signature of the Comprehensive Economic and Trade Agreement (CETA) between Canada, on the one hand, and the EU and its member States, on the other. One of the main authors of what ultimately became the Declaration by the Commission and the Council on investment protection and the Investment Court System (‘ICS’).
- Counsel to the Democratic Republic of the Congo in annulment proceedings before the Paris Court of Appeal – UN Convention against corruption.
- Counsel to Yukos Universal Ltd. in Belgian recognition and enforcement proceedings in Yukos Universal Ltd. v. Russian Federation.
- Counsel to Mr. Viorel Micula in Belgian enforcement proceedings of the ICSID arbitration award in Micula v. Romania (European Commission intervening) (pending).
- Counsel to an investor in an UNCITRAL investment arbitration case against a European country (claim decided on the merits).
- Counsel to the Kingdom of Belgium in ICSID Case No. ARB/12/29, Ping An Life Insurance Company, Limited and Ping An Insurance (Group) Company, Limited Belgium (claim dismissed on preliminary objections).
- Counsel to the Republic of Burundi in ICSID Case No. ARB/13/7, Joseph Houben v. Republic of Burundi (Mr. Gilbert Guillaume, President. Mrs. Brigitte Stern and Yas Banifatemi, arbitrators).
- Counsel to the Council of the Western European Union and its former Member States regarding the closure of the organisation and succession to its residual rights and duties.
- Counsel to the Kingdom of Belgium in Mukeshimana a.o. v. Belgian State before the Belgian courts (tort liability regarding the Rwanda genocide).
- Counsel to the Belgian State in Touax and Touax Rom v. Belgium. Proceedings in the Belgian courts on a claim for damages for Belgium’s participation in the NATO air strikes in the Kosovo.
- Counsel to the Kingdom of the Netherlands regarding the delimitation of a Belgian off-shore windmill park in the North Sea.
- Counsel to the central bank of a G7 member state regarding its immunities from execution.
- Lead counsel to La Générale des Carrières et des Mines (Gécamines) in FG Hemisphere Associates v. DRC and Gécamines before the courts of Jersey and the Privy Council.
- Counsel to Total SA (then TotalFinaElf) in Aung Maw Zin v. Total and Thierry Desmarest before the Belgian Supreme Court (Cour de cassation) and Constitutional Court regarding universal jurisdiction regarding alleged complicity with international crimes in Myanmar.
- Counsel to the Republic of Burundi in ICSID Case No. ARB/01/2, Antoine Goetz and others and S.A. Affinage des Métaux v. Republic of Burundi (Mr. Gilbert Guillaume, President. Messrs. Jean-Denis Bredin and Ahmed El-Kosheri, arbitrators).
- Expert Witness on questions relating to the Energy Charter Treaty in Kyrgyz Republic v. Petrobart, arbitration under the aegis of the Arbitration Institute of the Stockholm Chamber of Commerce.
- Counsel to the Democratic Republic of Congo in the annulment proceedings re Patrick Mitchell v. Democratic Republic of Congo, ICSID Case No. ARB/99/7.
- Counsel to the Kingdom of Belgium in the Arbitration regarding the Iron Rhine (“Ijzeren Rijn”) Railway, Kingdom of Belgium v. Kingdom of The Netherlands, under the aegis of the Permanent Court of Arbitration (Dame Rosalyn Higgins, President, Professors Alfred Soons and Eduard Somers, arbitrators).
- Counsel to the European Space Agency in various disputes relating to the Agency’s immunities and public procurement in matters of space technology.
- Counsel to Mr. David Zollmann regarding United Nations sanctions against UNITA.
- Counsel to Générale des Carrières et des Mines in Ridgepointe Overseas Developments Ltd. v. Democratic Republic of Congo and Générale des Carrières et des Mines, ICSID Case No. ARB/00/8.
- Counsel to Libya in the Case concerning Questions of Interpretation and Application of the 1971 Montreal Convention arising from the Aerial Incident at Lockerbie, preliminary objections (Libyan Arab Jamahiriya v. United States and Libyan Arab Jamahiriya v. United Kingdom, International Court of Justice.