Actually, I think that a lot of professors are probably ENFj (in reference to an earlier comment...).
Yes and no. Stereotypical university professors yes, but there are many fields in which non-NTs are present as these fields act as extensions of jobs, careers, and professions which appeal to other types. So you may be more likely to see an ISTj accounting professor or an ENFj journalism professor, but the 3 Crazy P's (physics, philosophy, psychology) professors may be ENTps while the political science or genetics professor is an INTj. I do think that there are different types reprsented within fields as these types may have an appeal for a certain field for different reasons and each type would bring a new perspective to the field as to expand it in exciting and unexplored ways.