Stevens Rehen is a Brazilian neuroscientist, specialized in stem cell research. He is Professor at the Institute of Biomedical Sciences at the Federal University of Rio de Janeiro and Researcher at D’Or Institute for Research and Education (IDOR). He is also member of the Latin American Academy of Sciences and the World Academy of Sciences for the Developing Countries (TWAS). Together with colleagues from California, Stevens is author of the first papers describing the existence of genetic mosaicism in the human brain.