Mark Sivertsen (born Mark Duane Sivertsen, May 7, 1959, in Fairfield, California) is an American actor, producer, and stunt performer, 6′ 1″ (185 cm) tall. As an Air Force brat, he was raised in northern California before moving to Los Angeles at 19. He began his career as a stuntman, transitioned to modeling, and then into acting, landing his first on-screen role in 1985. Over his 40-year career he has appeared in over 340 commercials and frequently portrays law enforcement officers, agents, and soldiers. He holds dual residency in Los Angeles and Taos, New Mexico, and is married to Michelle Silva (since 2023). His most notable film credits include Bucho in The Last Stand (2013, with Arnold Schwarzenegger), State Trooper in Paul (2011, with Simon Pegg and Nick Frost), Agent Skiletti in Felon (2008), Lt. Roberts in Shot Caller (2017), Dylan Cobb in Intrusion (2021, Netflix), Kirk in Silk Road (2021, with Jason Clarke and Nick Robinson), Ray in Blood and Money (2020), Highway Patrolman in Vampires (1998), Bailiff in North Country (2005), a role in Love Ranch (2010), Phillip Smiles in Drunktown's Finest (2014, Sundance), and Vice-President Lewis Parker in Art of Deception (2019). On television he is best known for Breaking Bad (2010), The Walking Dead (2020), Yellowstone (2018, 2024), Outer Range (2022), Castle (2015), Criminal Minds (2005), Dig (2015), Drop Dead Diva (2009, 2014), NCIS (2003), CSI: Miami (2002), JAG (1995, 2004), Stumptown (2019), Graves (2016), and Ballers (2017).