I'd venture the difference is being a professor vs. a practitioner. To profess is to talk and teach and expand the opportunities of the discipline by lodging th

I'd venture the difference is being a professor vs. a practitioner. To profess is to talk and teach and expand the opportunities of the discipline by lodging the ideas in peoples minds. A practitioner is someone who actually does something, but it doesn't really scale much past their own ability to physically do it. They have a practice. One plants, the other harvests. Such a good question to pose though.