Nathan is a philosophy friend of Katelyn's. On voting, he defends the position that most people should not vote. On meta-ethics, we consider whether moral claims are objective facts that can be evaluted as true or false, or if they're just expressions of emotional dispositions towards certain practices (e.g. "Boo murder!"). At the beginning of the episode Katelyn said that he was currently a grad student in psychology, but he actually recently graduated.