Mark L. Young (born Markell V. Efimoff) is an American actor.


Young was born as Markell V. Efimoff in Everett, Washington, on New Year's Day 1991. He began acting at the age of nine. Three years later, he moved to Los Angeles, California, to pursue a proper acting career. His first significant on-screen credit was a small role in two episodes of the HBO-produced series Six Feet Under. He has since made appearances in TV shows such as The OC, Dexter, Big Love, Childrens Hospital, Heroes, Secret Life of the American Teenager, Cold Case, ER, CSI: Crime Scene Investigation, Criminal Minds, and The Inbetweeners. Young's film credits include Sex Drive, Happiness Runs, The Lucky Ones, and We're the Millers.

On Criminal MindsEdit

Young portrayed teenage serial killer Owen Porter, who murdered several residents in an Alaskan town in the Season Five episode Exit Wounds.


  • Dirty Lies (2015) as Josh
  • The Comeback (2014) as Tyler Beck (8 episodes)
  • Tammy (2014) as Jesse
  • Mind Games (2014) as Ryan McKee
  • Betas (2013-2014) as Trevor (5 episodes)
  • Movie 43 (2013) as Calvin (uncredited)
  • The Neighbors (2013) as Logan
  • Beneath (2013) as Grubbs
  • We're the Millers (2013) as Scottie P.
  • Kroll Show (2013) as Mark's Son
  • Workaholics (2013) as Simon
  • The Inbetweeners (2012) as Neil Sutherland (12 episodes)
  • CSI: NY (2010) as Tom Reynolds
  • Childrens Hospital (2010) as Raye LePlante
  • Criminal Minds - Exit Wounds (2010) TV episode - Owen Porter
  • Happiness Runs (2010) as Victor
  • Heroes (2009) as Jeremy Greer (2 episodes)
  • The Secret Life of the American Teenager (2009) as Thomas (2 episodes)
  • Big Love (2009) as Franky (4 episodes)
  • Sex Drive (2008) as Randy
  • The Lucky Ones (2008) as Scott Cheaver
  • CSI: Crime Scene Investigation (2007) as Tommy Halpert
  • ER (2007) as Evan Hayes
  • Dexter (2006) as Jeremy Downs (2 episodes)
  • Cold Case (2006) as Jed Huxley, 1979
  • CSI: Miami (2005) as Lucas Hall
  • In Memory of My Father (2005) as Middle Chris (scenes deleted)
  • The O.C. (2004-2005) as Prepubescent Geek #1/Geek (2 episodes)
  • Six Feet Under (2003-2004) as Eric Sheedy (2 episodes)
  • Harry + Max (2004) as Harry, Aged 15
  • Rogues (2003) as Choir
  • Still Standing (2003) as Kid #1


  • Jessie's Girl (2012) - The Inbetweeners - 1 episode


For an up-to-date filmography, see here.

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