R. Eyslee was a mid-22nd century Starfleet officer.
In 2151, Eyslee was noted on the dedication plaque of the Enterprise NX-01 for his work on the ship's imaging and sensor technologies. (Star Trek: Enterprise set artwork)
In January of 2155, Eyslee worked in EECOM at the Fleet Operations Center on Earth. Eyslee's office was located in room 1350. (ENT: "Demons" set artwork)
Eyslee's name was listed on the dedication plaque of the NX-01 and on directory listings seen on the set of "Demons".