Lester Knopf is a person who works for the National Parks Service. He attended the parks conference in the episode entitled "Moving Up." In this episode, Leslie picks up his name tag and then says, "Lester Knopf? Come on, guys, get it together." And then Lester comes up and says, "That's mine," and snatches it from her. In this same episode, Leslie calls Grant Larson to accept a job working for the National Parks Service, and in a moment of panic while she is saying the voicemail she says, "This is Lester Knopf."