Subject: Re: LOL! Poor Old Dementia Joe
Sez Ron Ozio, the university’s director of media relations: "Penn has many different models of professorships. Not all are tenure-track and involve teaching regular classes. Some are clinicians, some are researchers, and others are professors of the practice, the category that applied to President Biden."

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OK, I get it now. "Professor" is just a job title, where each organization can define it and confer it as suits them. I once had a job in an IT department where first line supervisors were given the title "Principal" even though the skills and duties had nothing to do with schools.