Agent Easton was a member of Arthur Claypool's Secret Service security detail.
Because he wasn't an experienced field agent, Easton made some questionable decisions regarding Claypool's protection. These included leaving Claypool unaccompanied during a PET scan, locking Shaw up in an office without searching the room and not making sure his own food was safe to eat. These mistakes respectively allowed Elizabeth Ross to interrogate Claypool, Finch to contact Shaw via cell phone and Vigilance to drug him.