John Mellor-Crummey’s research focuses on software for high performance and parallel computing, including compilers, tools, and runtime libraries for multicore processors and scalable parallel systems. His current work is principally focused on performance tools for scalable parallel systems. His group’s HPCToolkit performance tools are used on systems around the world ranging from laptops to supercomputers. Recently, he has been co-leading the design of a performance tools interface for OpenMP 5.0, working with DOE labs and system vendors on the software stack for the forthcoming CORAL supercomputers, and leading a performance tools project as part of the DOE’s Exascale Computing Project.