Colonel Thomas Nelson was the Director of the SCYTHE Program, a secretive Army initiative meant to complement the military's existing production capacity by covertly converting civilian factories. Notable corporations he worked with involved HalluciGen, Incorporated and Wilson Atomatoys. The latter was a particularly unpleasant experience, as Arlen Glass, the company's co-founder and head engineer was disgusted by Marc Wilson's decision to convert a toy factory into an assembly line for land mines of all things. Nevertheless, the incident did not seem to affect relations between Col. Nelson and the company's CEO, as he saw fit to give Marc advance warning on the coming nuclear exchange.
Thomas Nelson is mentioned only in Fallout 4.