What do you call a university-level instructor/lecturer who’s in charge of a course? For example, suppose a course is split between two instructors, with one of them being responsible for the course as a whole. Are there any titles for this person which are more established than others? Some alternatives I’ve seen are main instructor, head instructor, or responsible instructor. Which is to be preferred, and are there any better alternatives?
(If the answer would vary by region, I’d prefer an American-style choice.)