Choongseok (CS) Chang

Managing Principal Research Physicist

Choongseok (CS) Chang has been leading multi-disciplinary teams for a couple of decades – nurturing close collaboration among physicists, computer scientists, applied mathematicians, and AI/ML scientists – for extreme-scale simulation of complex nonlinear multiscale tokamak fusion plasma on world's largest computers. Under his leadership in multiple US fusion SciDAC projects and exascale computing projects (ECP), the well-known gyrokinetic code XGC has been developed with topmost blessings from world-leading supercomputing centers and manufacturers. He has been organizing or co-organizing numerous important US-DOE and international conferences and computational/AI reports. He is a Fellow of the American Physical Society. His other endeavors prior to joining PPPL include long-term faculty tenures at KAIST (Korea Advanced Institute of Science and Technology) and Courant Institute of Mathematical Sciences, New York University, with teaching and training of a few dozen PhD students and postdoctoral fellows. He led the 2017 Fusion Energy Science Requirement Review for DOE FES and ASCR ( and the Physics Design of KSTAR tokamak.

Selected Publications