Clark Duke (born May 5, 1985, in Glenwood, Arkansas, USA) is an American actor known for his roles in the films Kick-Ass, Sex Drive, Hot 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."