Ken Roy is a retired professional engineer. His career involved working for various Department of Energy (DOE) contractors in the fields of Fire Protection and Nuclear Safety. 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 and large moons well outside the star’s Goldilocks’ zone and under stars that have a radically different spectrum from that provided by our sun. Ken has authored multiple papers on terraforming and space colonization that have appeared in JBIS and Acta Astronautica.