Philippe Ciais is a researcher of the Laboratoire des Sciences du Climat et de l'Environnement (LSCE), the climate change research unit of the Institut Pierre Simon Laplace (IPSL). He is a physicist working on the global carbon cycle of planet Earth, climate change, ecology and geosciences. Professional career. Philippe Ciais studied physics at École normale supérieure and received a PhD in 1991 entitled “Holocene climate record of Antarctic ice cores”. In 1992 he was a post-doctoral fellow at National Oceanic and Atmospheric Administration (NOAA) in Boulder, Colorado, U.S.
https://en.wikipedia.org/wiki/Philippe_Ciais