He is an internationally-renowned Professor of Decision theory under uncertainty, with applications in climate economics, finance and cost-benefit analysis and a special interest in long term (sustainable) effects. He is a fellow of the Econometric Society, and received an ERC Advanced Grant in 2011. He founded the Toulouse School of Economics alongside Jean Tirole, where he has served as director (2007-2015), vice-president (2017), and director again since December 2017. He is currently president-elect of the European Association of Environmental and Resource Economists (EAERE). In recent years, he has held visiting sabbatical positions at Harvard (2013) and Columbia (2015-2016). He has published more than 100 articles in top journals in economics, is one of the lead authors of the last two IPCC reports, and is the author of several books published by MIT Press, Princeton University Press and Columbia University Press. His most recent outreach book in French (Le climat après la fin du mois, PUF, 2019) on the importance of acting to mitigate climate change, has met with wide success in France, and is currently under translation into English.