There are multiple artists named Greg Ellis:
1) Greg Ellis (born in California, United States) is a drummer and percussionist. He is a member of Vas and Juno Reactor.
2) Greg Ellis (born 21 March 1968 in Wigan, England, UK) is a British actor who starred in the Andrew Lloyd Webber musical Starlight Express and appeared on the 1992 New Cast Recording. He was also a member of the Original London Cast of Miss Saigon.