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Clark Duke (born May 5, 1985 in Glenwood, Arkansas, USA) is an American actor known for his roles in the films Kick-AssSex DriveHot Tub Time Machine, and A Thousand Words, as well as playing Dale Kettlewell in the TV series Greek, Clark Green in The Office and Barry in Two and a Half Men.

He provided the voice of Justin Rockcandy in the Adventure Time episode "The Diary."