John R. Steel
John Robert Steel is an American set theorist at University of California, Berkeley. He has made many contributions to the theory of inner models and determinacy. With Donald A. Martin, he proved projective determinacy, assuming the existence of sufficient large cardinals. He earned his Ph.D. in Logic & the Methodology of Science at Berkeley in 1977 under the joint supervision of John West Addison, Jr. and Stephen G. Simpson.
In 2015 the European Set Theory Society awarded him and Ronald Jensen the for their paper "K without the measurable".
