At the request of program sponsors, the Krell Institute contracted with Westat, an employee-owned research corporation based in Rockville, Maryland, to conduct a study of the more than 550 DOE CSGF fellows and alumni as of fall 2021. The resulting report was a follow-up to 2012 and 2017 studies and summarizes data and reflections collected via surveys, phone interviews, and curriculum vitae analysis. Thanks to the responsiveness of current and past fellowship recipients, the study provides a comprehensive look at the satisfaction and impact of those the program supported over its first three decades. In addition, it speaks to the impressive professional pursuits and products of alumni now making their mark in fields related to computational science and engineering.