E. Regan was a member of Starfleet in the 22nd century.
In January of 2155, Regan worked in Operations Support at the Fleet Operations Center on Earth. Regan's office was located in room 3539. (ENT: "Demons" set artwork)
Regan's name was seen on directory listings seen on the set of "Demons".
E. Regan was named after Enterprise costumer Erin Regan.