Jiguang Sun is the Richard and Elizabeth Henes Endowed Professor of Mathematics at Michigan Technological University. He received his B.S. from Tsinghua University in 1996 and his Ph.D. from the University of Delaware in 2005. His research interests include numerical analysis, computational methods for eigenvalue problems, and inverse scattering theory.Aihui Zhou is a professor at the Academy of Mathematics and Systems Science of the Chinese Academy of Sciences. He received his Ph.D. from the Institute of Systems Science of the Chinese Academy of Sciences in 1991. His research focuses on mathematical understanding and numerical approximation of electronic structure models and related topics.