Mark L. Young0

Mark L. Young

Mark L. Young (born 1 January 1991) is an American actor.

He played Jeremy Downs, a budding serial killer, on Showtime's DEXTER.


Season One:


His first significant television credit was a small role in two episodes of Six Feet Under. His other appearances include The OC, Big Love, Childrens Hospital, Heroes, Secret Life of the American Teenager, Cold Case, ER, CSI: Crime Scene Investigation, and The Inbetweeners.

His film credits include Sex Drive, Happiness Runs, The Lucky Ones, We're the Millers, and Daddy's Home.

Personal Life

Young began acting at the age of nine and moved to Los Angeles when he was twelve to pursue his career. He attended LaSalle University.


  • He was born as Markell V. Efimoff.


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