Michael Grätzel (born 11 May 1944, in Dorfchemnitz, Saxony, Germany) is a professor at the École Polytechnique Fédérale de Lausanne where he directs the Laboratory of Photonics and Interfaces.
He pioneered research on energy and electron transfer reactions in mesoscopic-materials and their optoelectronic applications.
He co-invented with Brian O'Regan the Grätzel cell in 1988.Author of over 1000 publications, two books and inventor or co-inventor of over 80 patents, he has been the Mary Upton Visiting Professor at Cornell University and a Distinguished Visiting Professor at the National University of Singapore, and is currently a Distinguished Scientist at King Abdulaziz University.
He was an Invited Professor at the University of California, Berkeley, the École normale supérieure Paris-Saclay and Delft University of Technology.