J. Eaves was a mid 22nd century Starfleet officer.
In 2151, J. Eaves was noted on the dedication plaque of the Enterprise NX-01 for his work on the ship's spaceframe engineering. (Star Trek: Enterprise set artwork)
In January of 2155, Eaves worked in EECOM at the Fleet Operations Center on Earth. Eaves' office was located in room 1206. (ENT: "Demons" set artwork)
Eaves' name was listed on the dedication plaque of the NX-01 and on directory listings seen on the set of "Demons".