G. Reeves-Stevens was a Human Starfleet officer in the 22nd century.
In 2154, he was listed as a Mission Operations officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque)
In January of 2155, he was listed as a Missions Operation officer on directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. His office was located in room #1189. (ENT: "Demons", directories)
This character was only mentioned in writing.
It was possible that G. Reeves-Stevens and J. Reeves-Stevens were related. G. Reeves-Stevens was named after "Demons" co-writer Garfield Reeves-Stevens.