Dennis Keiffer is an actor, stunt choreographer, martial artist and stunt performer who has often played thugs or villainous supporting characters. He's provided stunts and guest-starred on shows such as "Martial Law", "Alias", "24", "Breaking Bad", the new "Hawaii Five-0", "Banshee", "Project S.E.R.A." and "Sons of Anarchy". He appeared in films such as Death Sentence, Bitch Slap, The Green Hornet, Bad Ass 2: Bad Asses, The Equalizer and John Wick. He has doubled actors and other stuntmen in films such as 2007's Live Free or Die Hard and 2009's Star Trek.