Dr. Schulman is an imaginary psychologist and family therapist by Lisa Simpson.
History[]
He appeared when Lisa asked how many times they could watch Homer being chased by an angry mob before they get psychologically affected. But, when Lisa started talking to him, Marge wondered why was Lisa talking to an empty seat. It is also implied that Lisa "sees" him every Tuesday, as she says that she will see him next Tuesday, but she then realizes that he is in Maui.