Kenneth Roy is a retired, professional engineer who is currently living in Oak Ridge, Tennessee. As a long-time hobby he has been working with the idea of terraforming. He invented the “Shell Worlds” concept as a way to terraform planets well outside a star’s Goldilocks’ zone. Kenneth is a founding member of the not-for-profit corporation Interstellar Research Group (IRG) and remains active in that organization. He enjoys reading science fiction, history, alternative history, military history, and books and papers on space colonization and terraforming. He served as co-editor for a hard, science-fiction anthology, The Ross 248 Project, published by Baen Books, and a three volume, Interstellar Monograph Series, published by Elsevier.