W.M. Jefferies
W.M. Jefferies was a Human Starfleet officer in the 22nd century. He was one of the designers of the  starships. ()

In the 2140s, as a captain, Jefferies was an engineer on the NX Program. This program was part of an effort to develop and refine the warp five engine. Lieutenant Charles Tucker III was among the officers assigned to Jefferies' team. ()

While designing the NX-class, Captain Jefferies was a proponent of installing powerful weapons on the ship. Jonathan Archer, captain of , once had an argument with Jefferies regarding this topic, asserting that he did not want to be captain of a warship attempting to make peaceful first contact with other species. However, upon his return from the Delphic Expanse, during which Enterprise engaged in battle numerous times, Archer admitted that Jefferies had probably been correct. ()

In the 2150s, he was named as an UESPA representative on the dedication plaques of the  starships, namely the Enterprise in 2151, and the  in 2154. (, dedication plaque; , dedication plaque)

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Humans
UESPA personnel
Enterprise (NX-01) dedication plaque personnel
Columbia dedication plaque personnel
Starfleet captains