Michael L. Overton is Silver Professor of Computer Science and Mathematics at the Courant Institute of Mathematical Sciences, New York University. He received his Ph.D. in computer science from Stanford University in 1979. He is a fellow of SIAM (Society for Industrial and Applied Mathematics) and of the IMA (Institute of Mathematics and its Applications, UK). He served on the council and board of trustees of SIAM from 1991 to 2005, including a term as chair of the board from 2004 to 2005. He was editor-in-chief of SIAM Journal on Optimization from 1995 to 1999 and of the IMA Journal of Numerical Analysis from 2007 to 2008 and was the editor-in-chief of the MPS (Mathematical Programming Society)-SIAM joint book series from 2003 to 2007. He is currently an editor of SIAM Journal on Matrix Analysis and Applications, IMA Journal of Numerical Analysis, Foundations of Computational Mathematics and Numerische Mathematik.