J. Devlin was a Human Starfleet officer in the 22nd century.
In 2154, he was named as a Propulsion Systems officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque)
In January of 2155, he was named as a Flight Surgeon on directory placards at the Fleet Operations Center, Sol Sector. His office was in room #1365. (ENT: "Demons", directories)
J. Devlin was named after
Enterprise grip Jay Devlin.