Mr. Tiainen has a degree in Environmental Engineering from Helsinki University of Technology. He started his career as an environmental consultant focusing on water and sanitation issues in the 90’s. In mid-90 he moved from private to public sector. First to the Finnish Environment Institute SYKE and from there to the Ministry of the Environment. In 2010, he was nominated as a Head for the International Affairs Unit in the Ministry of the Environment. From June 2013 until October 2015 he worked as a Director General at the Unit of International and EU Affairs.