E. Ellis was a Human Starfleet officer in the 22nd century.
In 2154, he was listed as a member of the Flight Test Crew on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque)
In January of 2155, he was named as an Environmental Control officer on directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. His office was located in room #3523. (ENT: "Demons", directories)
This character was only mentioned in writing.
He was named for Enterprise make-up and special effects artist Earl Ellis, who also worked on Star Trek: Deep Space Nine, Star Trek: Voyager, Star Trek: Insurrection, and Star Trek.