Lois Curfman McInnes is a senior computational scientist in the Mathematics and Computer Science Division of Argonne National Laboratory. Her research focuses on scalable numerical algorithms in the PETSc library, as well as community collaboration toward productive and sustainable software ecosystems for extreme-scale computational science. Lois coordinates work on mathematical libraries in the U.S. DOE Exascale Computing Project. She is a SIAM Fellow. She received the 2015 SIAM/ACM Prize in CSE and an R&D 100 Award in 2009 (with collaborators); she won an E.O. Lawrence Award in 2011 for outstanding contributions to DOE. Lois received a Ph.D. in Applied Mathematics from the University of Virginia.