How the Exascale Computing Project and Private Magnetic Fusion Research Stimulated Each Other

We provide a brief summary and comments on how we utilized the Exascale Computing Project (ECP) supercomputing resources for the development of the frontal research of nuclear fusion reactor development. In turn, our demand and use helped stimulate the ECP hardware and software, and our project to tackle real-world simulation of fusion experiments has stimulated the ECP and its development. We posit that thus the legacy of the ECP is important and useful and that it will continue to have a growing impact on scientific progress.