M. DeMeritt was a Human Starfleet officer in the 22nd century.
In the 2150s, he was named as a Vehicle Development officer on the dedication plaque of the NX-class starships. (ENT: "Broken Bow", dedication plaque; ENT: "Affliction", dedication plaque)
In January of 2155, he was named as a Payloads officer on directory placards at Fleet Operations Center, Sol Sector. His office was room #1163. (ENT: "Demons", directories)