
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…

Bad Art
as Benji

Swing State
as Neil Hornback

Daddy's Home
as Dental Hygienist

The Curse of Downers Grove
as Ian

Tammy
as Jesse

We're the Millers
as Scottie P.

Beneath
as Grubbs

Happiness Runs
as Victor

Sex Drive
as Randy

The Lucky Ones
as Scott Cheaver

Filthy Rich
as Jason Conley · 10 ep.

Ten Days in the Valley
as PJ · 10 ep.

Life in Pieces
as Scarecrow · 1 ep.

Code Black
as Justin Keller · 1 ep.

The Inbetweeners
as Neil Sutherland · 12 ep.

Workaholics
as Simon · 1 ep.

Childrens Hospital
as Raye LePlante · 1 ep.

The Secret Life of the American Teenager
as Thomas · 2 ep.

Dexter
as Jeremy Downs · 2 ep.

Heroes
as Jeremy Greer · 2 ep.
Big Love
2006