Greg Ellis (born Jonathan Ashley Rees; 21 March 1968) is an English actor and voice actor best known for his role as Lieutenant Commander Theodore Groves in Disney's Pirates of the Caribbean film series and Michael Amador in 24 as well as voice-over work in over 100 video games titles.
On the big screen he is best known for his portrayal of Lieutenant Commander Groves in Disney's Pirates of the Caribbean film series as well as starring in J.J. Abrams Star Trek as Chief Engineer Olsen, the original chief engineer of the Starship Enterprise. He starred in the western Forsaken alongside Demi Moore with Donald Sutherland and Brian Cox.
He joined the cast of Hawaii Five-0 in season five to play Thomas Farrow in a major recurring arc, was a regular on the Fox drama Touch as Trevor Wilcox and played the villainous Michael Amador opposite Kiefer Sutherland in the 3rd season of the hit series 24. He also co-starred opposite Sir Anthony Hopkins and Angelina Jolie in Beowulf with Brad Pitt in Mr. and Mrs. Smith, and alongside Leonardo DiCaprio and Kate Winslet in Titanic.