Henri Waisman is senior researcher within IDDRI's Climate programme, in charge of ctivities on long-term low emission development trajectories. He is the coordinator of the Deep Decarbonization Pathways Project (DDPP), which is working with international partners to mobilize long-term analysis as a tool to support the political process initiated by the Paris Agreement. He is also in charge of promoting the DDPP's lessons on the use of forward-looking scenarios as a tool for dialogue to support the implementation of the transition to sustainable development.

After graduating from the École Normale Supérieure (ENS) of Lyon in physical sciences, Henri joined the CIRED (Centre International de Recherche sur l’Environnement et le Développement) in 2005 where he conducted modeling work for the analysis of socio-economic impacts of energy and climate issues. He holds a doctorate from the Ecole des Hautes Etudes en Sciences Sociales (EHESS) in Economics, with a specialization in Environment; his thesis focuses on the links between climate change mitigation policies, international energy markets and urban dynamics. Henri joined Iddri in December 2013.

Henri is a member of the Intergovernmental Panel of Experts on Climate Change (IPCC), as Lead Author for the Special Report on 1.5C