(written from a Production point of view)
John Duff is an actor who served as running double for Tommy "Tiny" Lister, Jr.'s Klaang in the Star Trek: Enterprise pilot episode "Broken Bow". Duff doubled Lister, Jr. during the chase in the cornfield, filmed on location in Bakersfield on 12 June 2001 and 13 June 2001.
Duff, who is the brother of fellow actor and former football player Jamal Duff, had supporting roles in three films alongside The Rock; 2003 in the action comedy The Rundown, which features Trek performers William Lucking, Dennis Keiffer, Todd Stashwick, and Jeff Chase, 2007 in the comedy The Game Plan, along with Gordon Clapp, and 2009 in the science fiction remake Race to Witch Mountain, along with Ike Eisenmann, Bob Clendenin, John Kassir, and Arne Starr.
Other appearances include an episode of Angel (2004, with Alec Newman and Kevin Grevioux), the action drama Circuit 3: The Street Monk (2006, with Kevin Indio Copeland and James Lew), the action drama Lords of the Underworld (2007, with Derek Graf, David Mattey, Justin Riemer, and Douglas Tait), and more recently the horror film Blood: The Last Vampire (2009, with Joey Anaya).