Quote Originally Posted by Godhand View Post
That will be down to the translation and how suffixes like "-san" and "-kun" were handled. Occasionally you do get things like "Barret-san" rather than "Wallace-san", and obviously the closest thing to that is "Mister Barret".

I'm fairly sure "Professor" as a title isn't a suffix in Japanese, so the usage couldn't be the same as "-san", but I can't speak to that, not being an expert or having studied it at all.
In Japan, hakase ("doctor" or "professor") is indeed used as a suffix after someone's name, much like sensei ("teacher" or "master") is.