(written from a Production point of view)
Vanessa Grayson is an actress who worked as stand-in for Marina Sirtis on Star Trek: Insurrection and Star Trek Nemesis. She previously appeared as a beauty attendant in the Star Trek: The Next Generation fourth season episode "The Host". Grayson filmed her scene for "The Host" on Friday 15 March 1991 on Paramount Stage 9.
She stood-in for actresses such as Tia Carrere (1993 in Rising Sun), Julianna Margulies (in ER and 2001 in The Man from Elysian Fields), Melinda Clarke (1997-1998 in Soldiers of Fortune, Inc.), Rachel Griffiths (2006-2007 in Brothers & Sisters), Sean Young (2000 in The Amati Girls), Jennifer Lopez (1995 in Money Train, 1997 in Anaconda, 2002 in Enough, and 2003 in Gigli), Clea Duvall (2003 in Carnivale), Catherine Zeta Jones (1999 in The Haunting), Penelope Cruz (2001 in Captain Correlli's Mandolin and Vanilla Sky), Gina Gershon (1998 in Legalese), and Carrie Ann Moss (2007 in Disturbia).
More recently in 2011, Grayson worked on the television series Southland.