J. Anderson was a Human Starfleet officer in the 22nd century.
In January of 2155, she was listed as a Telemetry officer on directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. Her office was located in room #4318. (ENT: "Demons", directories)
This character was only mentioned in writing.
She was named after Enterprise background actress and stand-in Geneviere "Jen" Anderson.