Claire C. Ralph is currently a Department of Energy Computational Science Graduate Fellow at Cornell University where she is pursuing her doctorate in theoretical chemistry. Her thesis research is in developing efficient, highly parallel algorithms for quantum mechanical computations. Santiago R. Simanca is currently a Distinguished Visiting Professor on a Chaire Regional Senior des Pays de la Loire at the University of Nantes, where he is pursuing his interest and collaborations in global analysis and geometric PDEs. He had been on the faculty in the Departments of Mathematics at the State University of New York, Stony Brook, and at the University of New Mexico, Albuquerque. He received his PhD from the Massachusetts Institute of Technology.