(written from a Production point of view)
Joel J. Kramer (born 10 September 1957; age 56) is a stuntman, stunt coordinator, and director who portrayed the Klingon helmsman in Star Trek: The Motion Picture. A Star Trek Customizable Card Game card was released including an image of Kramer and his non canon name "Karnog". 
Born in Tucson, Arizona, Kramer is a close friend and personal stunt double for Arnold Schwarzenegger in films such as Commando (1985), The Running Man (1987), Twins (1988), Total Recall (1990), Terminator 2: Judgment Day (1991), Last Action Hero (1993), Jingle All The Way (1996), and Batman & Robin (1997).
Among his stunt resume are films such as Invaders from Mars (1986, with Louise Fletcher, Eric Pierpoint, Donald Hotton, William Frankfather, Eric Norris, Scott Leva, and stunts by Tony Brubaker, Dana Dru Evenson, Spiro Razatos, and Lincoln Simonds), Predator (1987, with Richard Chaves, Kevin Peter Hall, and stunts by Gary Baxley, Tony Brubaker, and Doug Coleman), Moonwalker (1988, with Nikki Cox), Total Recall (1990, with Michael Champion, Ronny Cox, Roy Brocksmith, Lycia Naff, Marc Alaimo, Ken Gilden, Frank Kopyc, Robert Picardo, and stunts by Simone Boisseree, Ann Chatterton, Vince Deadrick, Jr., Doug Coleman, Dana Dru Evenson, Nick Dimitri, Freddie Hice, Cherie Tash, and Vince Deadrick), Terminator 2: Judgment Day (1991, with Nikki Cox and Jenette Goldstein), The Bodyguard (1992, with Bill Cobbs, Mike Starr, Bert Remsen, Donal Hotton, Douglas Price, Tyce Bune, John Tesh, and stunts by Dan Koko), Eraser (1996, with Vanessa Williams), Batman & Robin (1997, with John Glover), Pearl Harbor (2001), The Last Samurai (2003), Collateral (2004), and Death Sentence (2007).
His resume also includes television series such as Knight Rider (1984, with Rick Avery and Spike Silver), Scarecrow and Mrs. King (1986), V.I.P., Lois & Clark (starring Teri Hatcher), Wonder Woman, The A-Team (starring Dwight Schultz), MacGyver, Dallas, Dynasty (starring Joan Collins), T.J. Hooker (starring William Shatner and James Darren), Baywatch, and The Love Boat.
More recently, Kramer served as stunt coordinator and second unit director on the science fiction series Terminator: The Sarah Connor Chronicles (2008), with regular Thomas Dekker and semi-regular Matt McColm. Kramer received an Emmy Award nomination for the coordination of the episode Gnothi Seauton for which Spice Williams-Crosby, Edward Conna, Diana R. Lupo, and Scott Leva performed stunts.