He has more than 25 years of experience in European Affairs and, as negotiator, in multilateral diplomacy. He has participated in several initiatives of the United Nations system and has advised Arab Gulf States in negotiations of Free Trade Agreements, particularly with the European Union, and was the Delegate of the United Arab Emirates at the World Trade Organization. During his WTO mandate, Roger introduced raw materials into the Doha Round, coordinating this area of negotiation between 2003 and 2010. Roger also participated in the creation of the IDEX defence fair in Abu Dhabi as advisor to the Chairman of the military organising committee. Very involved in the world of international conferences, Roger co-organised, inter alia, the first European research conference and exhibition, the first European summit on sovereign wealth funds and, with the United Nations, the first conference on the transition to the green economy of emerging powers. He has been an advisor of the Gulf aluminium industry from 1998 to 2015 and co-founded in 1999 the Federation of Aluminium Consumers in Europe (FACE) which today brings together European, Russian and Gulf players. Roger actively participated in the negotiation, ratification and implementation process of the Paris Climate Agreement between 2015 and 2017 as advisor to the COP22 Presidency. Roger is now the senior advisor for European and multilateral affairs of a leading aluminium producer and is the Vice President of the EnergyPact Foundation.