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Acting
Born Markell V. Efimoff in Everett, Washington, Young began acting at the age of 9 and moved to Los Angeles when he was 12 to pursue his career. His first significant on-screen credit was a small role in two episodes of the HBO series Six Feet Under. Young's other notable appearances include television shows The OC, Dexter, Big Love, Childrens Hospital, Heroes, Secret Life of the American Teenager, Cold Case, ER, CSI: Crime Scene Investigation and The Inbetweeners, while his film credits include Sex Drive, Happiness Runs, a turn as Tim Robbins' character's son in The Lucky Ones, and We're the Millers, a comedy starring Jennifer Aniston, Emma Roberts, Will Poulter, Jason Sudeikis, Ed Helms, and Nick Offerman.

Filthy Rich
as Jason Conley

Bad Art
as Benji

Ten Days in the Valley
as PJ

Swing State
as Neil Hornback

Daddy's Home
as Dental Hygienist

Code Black
as Justin Keller

Life in Pieces
as Scarecrow

The Curse of Downers Grove
as Ian

Tammy
as Jesse

Beneath
as Grubbs

We're the Millers
as Scottie P.

Betas
as Trevor

The Inbetweeners
as Neil Sutherland

Workaholics
as Simon

Happiness Runs
as Victor

Childrens Hospital
as Raye LePlante

Sex Drive
as Randy

The Lucky Ones
as Scott Cheaver

The Secret Life of the American Teenager
as Thomas

Dexter
as Jeremy Downs

Heroes
as Jeremy Greer

Big Love
as Franky

Criminal Minds
as Owen Porter

The Comeback
as Tyler

Veronica Mars
as Jimmy

Harry and Max
as Harry, Age 15

The O.C.
as Prepubescent Geek

Still Standing
as Kid #1

CSI: Miami
as Lucas Hall