Steve Jackson (mathematician)
Steve Jackson (full name: Stephen Craig Jackson) is an American set theorist at University of North Texas. Much of his most notable work has involved the descriptive set-theoretic consequences of the axiom of determinacy. In particular he is known for having calculated the values of all the projective ordinals (the suprema of the lengths of all prewellorderings of the reals at a particular level in the projective hierarchy) under the assumption that the axiom of determinacy holds.
thereby solving the first Victoria Delfino problem, one of the notorious problems of the combinatorics of the axiom of determinacy.
His Erdős number is 1.