I have a character, who I'm not sure how to name when I mention him in passing. I have three possibilities: "Hello," greeted Francois. "Hello," greeted the Professor. I want to avoid using the word "doctor" because there is another character who is a medical doctor and I want to avoid confusion. I'd like to know what images appear in your minds for each version given the knowledge that Francois LaBerge is an older man and theoretical physicist. They are not in an academic setting but are all intellectuals.