Raphaël Claustre is trained as a physics engineer. He is the General Manager of the public / private company Energie Posit’if. Energie Posit’if is a one-stop-shop for ambitious energy renovation of collective buildings in Île-de-France region. It offers co-owners of buildings all the expertise for renovations in terms of energy, architecture and financing. It will also soon deliver the financing for the renovation through an EIB loan. Raphaël used to be the General Manager of the French Energy Transition network (CLER) between 2007 and 2016. He was a member of the board of Climate Action Network France, Energie Partagée (Renewable Citizen Projects), MVE (East of Paris local energy agency). He also represented the Environmental NGOs at the French High Council for Energy and the Hugh council for construction and energy efficiency. He wrote 2 reports for the government « To what extent could energy renovation be mandatory » in 2013 and « Governance of energy transition, role of local and national authorities » in 2013. Between 2003 and 2007, he was in charge of European projets at CLER. He also worked as an engineer at CERN in Geneva between 2001 and 2003 and in the solar concentration furnace of Mont-Louis in 2001. He is a member of the board of Negawatt non-profit organisation.