Paolo Bertoldi has been working with the European Commission since 1985 and in 2015 he has been nominated Senior Expert. From 1985 to 1993 he was working in the EU nuclear fusion project, the Joint Undertaking Torus (JET) in the UK. For 1993 until April 2001, he was Administrator with the European Commission, DG Energy and Transport (DG TREN, Brussels Belgium), in charge of EU regulatory and voluntary programmes for energy efficiency in end-use equipment, buildings and industry. He was also in charge of voluntary agreements with industry and tertiary sectors and the GreenLight programme. Since May 2001, he is at the European Commission Joint Research Centre (Ispra, Italy), in charge of research activities on energy efficiency policy analysis, the efficient use of electricity (in particular ICT) and innovative policy instruments for energy efficiency (e.g. white certificates, financing mechanisms, ESCO, EPC, emission trading) and the Covenant of Mayors. He also manages the Covenant of Mayors research activities at the JRC. He has published over 100 articles on energy efficiency in scientific journals and conference proceedings, as well as over 100 reports. He has been a Contributing Author for IPCC Assessment Report 4, Lead Author for IPCC Assessment Report 5 and the Special Report on 1.5 C and recently he has been nominated Lead Author for IPCC Assessment Report 6. He is the Editor-in-Chief of the peer reviewed journal Energy Efficiency.