(written from a Production point of view)
John Gregory "Greg" Haines is the actor who served as stand-in for Ben Cross in 2009's Star Trek. Haines was originally scheduled to be a background performer, an instructor at Starfleet Academy, and did his wardrobe fitting but was chosen to be the stand-in and worked with J.J. Abrams and the cast several days in January 2008.
Haines also worked as stand-in on the 2009 crime drama Middle Men which featured Trek performers Kelsey Grammer and Christopher McDonald. He had background parts in episodes of Desperate Housewives (2006, with Teri Hatcher, Alfre Woodard, and Brenda Strong), Heartland (2007, with Jamie McShane), and Better Off Ted (2009, with Jay Harrington).
Among his film performances are the short comedy Bitch (2006), Emilio Estevez' drama Bobby (2006, with Christian Slater, Spencer Garrett, Kevin McCorkle, and Shana Golden), the short drama Essential Life (2008), and the television comedy Canned (2009).