The Mathematical Sciences Postdoctoral Research Fellowships are awards to recent recipients of doctoral degrees. The fellowship is designed to provide 24 months of support divided into 18 academic months and 3 periods of two summer months. The recipient has the option of a Research Instructorship which allows the 18 months of academic support to be taken as 9 months of full-time support and 18 months of half-time support. Mathematical Sciences Postdoctoral Research Fellowship awards allow fellows to choose research environments that will have maximal impact on their future scientific development. Sean Keel will receive his doctoral degree from the University of Chicago, and will pursue research in the area of pure mathematics, specifically, intersection theory of the moduli space of n-pointed stable curves of genus zero, under the guidance of Herb Clemens at the University of Utah, Salt Lake City.