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Alfred Tarski (January 14, 1902, Warsaw, Russian-ruled Poland – October 26, 1983, Berkeley, California) was a logician and mathematician who spent four decades as a professor of mathematics at the University of California, Berkeley. A member of the interwar Warsaw School of Mathematics, and active in the USA after 1939, he wrote on topology, geometry, measure theory, mathematical logic, set theory, metamathematics, and above all, model theory, abstract algebra, and algebraic logic. His biographers Anita Feferman and Solomon Feferman state (2004) that, "Along with his contemporary, Kurt Gödel, he changed the face of logic in the twentieth century, especially through his work on the concept of truth and the theory of models."