I am a research scientist at Oak Ridge National Laboratory (ORNL).
I direct the Center for Predictive Simulation of Functional Materials. I also lead development of the QMCPACK application for exascale computing as part of the Exascale Computing Project. QMCPACK is a very high performance Quantum Monte Carlo code for computing the electronic structure of atoms, molecules and solids, including metals. QMCPACK is open source and available on GitHub.
I am a member of the Nanotheory Institute at the Center for Nanophase Materials Sciences (CNMS) and the Computational Chemical and Materials Science group in the Computational Science and Engineering Division.
I spent three years at NREL with Alex Zunger after completing my PhD with Richard Needs at the University of Cambridge. For several years I worked with Mark Jarrell at the University of Cincinnati working on high-temperature cuprate superconductors. In 2009 I transitioned from JICS/UT Knoxville to ORNL staff.