Daniel Beysens, PhD in Physics and in Engineering, is a world specialist of water collection from air. He is the co-founder and President of OPUR International Organization for Dew Utilization. He is also emeritus Director ofResearchatEcoleSup´erieuredePhysiqueetChimiePariswherehecarries outwithhisteamexperimentalandtheoreticalstudyondewcondensationand phase transition. He started the field at the Alternative Energies and Atomic Energy Commission (CEA) when he was Head of Institute. He has authored or co-authored more than 450 publications in international scientific Journals and 11 books. He was awarded many prices in Physics and Environmental Sciences and is Knight of the Order of Academic Palms.