(written from a Production point of view)
Brandon Scott Stacy (born 9 April 1982; age 33) is an actor who was Zachary Quinto's stand-in on J.J. Abrams' Star Trek. He also shot a role as a Klingon guard in the film, but his scenes were deleted.   According to the IMDb, Stacy is also working as stand-in and photo double for Zachary Quinto on the Star Trek Into Darkness.
Stacy was born in Chesterfield, Virginia and appeared in 2000 as Milo Surgant in the Star Trek fan film series Star Trek: Hidden Frontier alongside fellow Star Trek performer James Cawley. He has since been cast by Cawley as Spock in the Star Trek: Phase II fan films. 
Stacy has had feature and supporting roles in the television series Passions (2004), Love, Inc. (2005), The King of Queens (2005), Joey (2005), The O.C. (2006, with Melinda Clarke and Michael Nouri), Weeds (2006, with Ron Canada and Andy Milder), and Help Me Help You (2006). He also performed in several stage plays and music videos for artists such as System Of A Down.
Among his feature and independent film resume are the short film Muscle (2005), the horror film Dead Men Walking (2005, with Tad Atkinson), the drama Grace & Mercy (2006), the horror comedy Suffering Man's Charity (2007), and as body double for Jim Carrey in Joel Schuhmacher's mystery thriller The Number 23 (2007, with Virginia Madsen, Ed Lauter, Rudolph Willrich, and alongside Kerry Hoyt).
More recently, Stacy performed in the short thriller Tangled Web (2008), the horror thriller Breathing Room (2008), and the comedy Spring Breakdown (2008, with Nicole Randall and stunt performers Boni Yanagisawa, Scott Workman, and Heidi Moneymaker).