Jefferson Errinwright is a student and son of UN Undersecretary Sadavir Errinwright.
Throughout the series Edit
In "The Monster and the Rocket", having heard the night terrors and screams, Jefferson asks what sort of monsters his father's nightmare are about. He wonders if the nightmare had anything to do with why Sadavir is walking his son to school as though he were still a young child instead of a teenager. This leads to his father trying to impart some potentially final sage advice, which presumably spooks the teenager.