I'm working on a story that takes place in a private school. It is a fantasy story, and magic is taught at the school, but the curriculum still centers around things like literature, algebra, history, biology, etc. My question is: Should the teachers be called Professer, or Mister/Miss/Miz/Missus? A couple of the teachers have actual doctorates, and are addressed as Doctor, but not the others. Is Professor too Hogwartsy? Too collegiate for what is basically a private high school? Or is Mr/Ms/Mrs too INformal, too public school?