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. Dr. Robin A. Alexander received his doctoral degree from the Massachusetts Institute of Technology, and will pursue research in the area of Probability Theory: "Random Walks with Reinforcement" under the guidance of Dr. David Aldous at the University of California, Berkeley.