Michael Graetzel, Ph.D. is a professor of physical chemistry at the Ecole Polytechnique Fédérale de Lausanne where he directs the laboratory of photonics and interfaces. He pioneered investigations of electron transfer reactions in mesoscopic systems and their application for electricity and fuel generation from sunlight and electricity storage in lithium batteries. He invented the dye-sensitized solar cell (DSC) that in turn engendered perovskite photovoltaics the most exciting break-through in the recent history of photovoltaics. The DSC is meanwhile commercially produced at the multi-Megawatt scale. He received the Global Energy Prize, the Millenium Technology Prize, the Balzan Prize, King Faisal International Science Prize, Einstein World Award of Science, Marcel Benoist Prize and many other awars.. He also received 10 honorary doctor’s degrees from European and Asian Universities. He presented close to 100 named lectures and published some 1400 peer-reviewed articles that received over 200’000 citations (h-factor =210 by ISE Web of Science) as well as several books and book chapters. He serves as editor or editorial board of 12 peer-reviewed journals. He is an elected member (fellow) of the Royal Chemical Society, the German and Bulgarian Academies of Science, the Max Planck Society and the Royal Spanish Academy of Engineering.