Charlene Yang is an application performance specialist at the National Energy Research Scientific Computing Center (NERSC), Lawrence Berkeley National Laboratory (LBNL). She focuses on performance analysis, characterization, and optimization for large-scale HPC applications. Charlene is an active developer of the Roofline performance model and has been heavily involved in its refinement, extension, user adoption, and vendor integration. Charlene holds a PhD in electronic engineering from the University of Western Australia.