(written from a Production point of view)
Melissa O'Keeffe is an actress who appeared as a Starfleet crewman in the final episode of Star Trek: Enterprise, "These Are the Voyages...". She also appeared as an alien ambassador in the episodes "Demons" and "Terra Prime". As a background actress she received no credit for this appearance.
O'Keeffe earned her BA in Journalism / Media Arts from the University of Arizona and trained acting under coaches Joel Asher, Amy Lyndon, and Richard Courtney. She performed in several stage plays in Phoenix and Los Angeles and was featured in the independent films Simply Me, School's Out, and Enough Said and the ER episode Lost in America (2006, with Scott Grimes, Leland Orser, Maury Sterling, and Mark Bramhall).
As a host she worked on the IESB productions TV Wire and Soldiers Radio and TV and the UA-TV production The Cat's Eye.