Jack Deslippe, NERSC Jack Deslippe is the application performance group lead at NERSC. Jack and his group are partnering with DOE application teams to evaluate and improve the performance of applications on HPC systems at NERSC as well exploring and influencing performance portability strategies. In addition, Jack was the ECP L3 lead in the Materials Science and Chemistry area. He received a Ph.D. from UC Berkeley in physics in 2011, with research centered on computational materials physics, including the development and scaling of electronic-structure codes. Jack has been at NERSC since 2011 and currently leads the NERSC Exascale Science Applications Program (NESAP).