E. Regan was a Human Starfleet officer in the 22nd century. In 2154, she was listed as an Environmental Systems officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque) In January of 2155, she was listed as an Operations Support officer on directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. His office was located in room #3539. (ENT: "Demons", directories) She was named after Enterprise costumer Erin Regan.