S. Shimizu was a Human Starfleet officer in the 22nd century.
'In the 2150s, she 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, she was named as a Flight Activities officer on directory placards at the Fleet Operations Center, Sol Sector. Her office was in room #1174. (ENT: "Demons", directories)