Tender is the Night
We don’t see much of him, but he’s important because he owns the clinic before Dick and Franz buy it and he diagnoses Nicole. Dick respects him but sees him as part of "the ghostly generation behind him." He represents the old way of practicing; Dick means to represent the new. When Dick continues seeing Nicole after Dohmler advises him to stop, Dick defies the old generation. But Dohmler’s predictions come true. He is eventually no good for Nicole. Is he wise, as Dick tells us in one moment, or does he, as Dick alludes is another moment, practice outmoded forms of psychiatry on her and worsen her mental health?