Ofer Gabber is an Israeli-French mathematician (with thesis under Barry Mazur), famous for his technical excellence in a number of mathematical subjects, now a CNRS member working at IHES. Gabber has produced very many results from foundational results to counterexamples, mainly in algebraic geometry, arithmetic geometry, number theory, representation theory and algebra, only small part of which are published, and many are known only indirectly via works of other mathematicians who were acquainted with his results.
German wikipedia: Ofer Gabber