Hello. "Cambridge University has a teaching system ... [which] is based on weekly, hour-long meetings called 'supervisions' when the member of the teaching staff (the supervisor) and the student (or two students) discuss their week's work. ... Students usually have two or three supervisions per week which may be complemented by lectures, classes and seminars." Source: UNITED KINGDOM AT A GLANCE by Roman Ociepa. A lecturer gives a lecture. A supervisor conducts a supervision. A tutor conducts a tutorial. What do you call an academic teacher who conducts a seminar or a class? Is it a professor?