W. Mayer was a member of Starfleet 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 an EGIL officer on the directory placards at the Fleet Operations Center, Sol Sector. His office was in room #1368. (ENT: "Demons", directories)