Acted as chairman, sole arbitrator or party-appointed arbitrator in over 200 international arbitration proceedings. Appointments as arbitrator by ICSID, the International Chamber of Commerce (ICC), the London Court of International Arbitration (LCIA), the American Arbitration Association, ICSID, the European Development Fund, CEPANI, the Netherlands Arbitration Institute, the Polish Chamber of Foreign Trade, the Vienna Arbitration Center, the United Nations and the Geneva Chamber of International Commerce; Acted as counsel in numerous arbitrations (ad hoc arbitration, ICC, CEPANI, LCIA, Chambre arbitrale de Paris, UNCITRAL); Subject matters covered : i.a. state contracts, turn-key projects, construction, engineering, public works (e.g. dam, power plant, roads, subway), investment contracts, BITs, joint ventures, share evaluations, international sales, agency and distributorship, transfer of technology, patents, cooperation agreements, software developments, shipping of goods, oil contracts, antitrust issues, mergers and acquisitions, securities trade, economic sanctions, export insurance, rescheduling of public debts, etc.; Standing arbitrator for Agreements between on one side Philip Morris, British American Tobacco and Imperial Tobacco and on the other side the E.U. and ten European Member States; Chairman Tribunal CSOB vs./ Slovak Republic–ICSID ( nr. 97/4), 2004; Exxon Mobil vs. Canada (NAFTA , ICSID AF 07/4) and first arbitration under PCA Environmental Rules; Tribunal Appointed Expert in Guyana vs. Suriname (The Hague–2006).; Appointing Authority in UNCITRAL arbitration, nominated by the Permanent Court of Arbitration; one of the 20 ‘most highly regarded individuals’ in arbitration (Global Arbitration Review – Commercial Arbitration 2009, p. 2); Regular lectures at the arbitration training programs and seminars of the International Centre for Dispute Resolution of the American Arbitration Association, ICC, School of International Arbitration, IBA etc. Trustee of the Dubai International Arbitration Centre (2004–2008); Member Commission on International Arbitration (ICC), London Club of Arbitrators, Milan Club of Arbitrators.; working groups on arbitration in the framework of the IBA, ICC, ILA etc.