Professor, countable or uncountable? [duplicate]

Yes and No.

To speak from experience:

I was a lecturer in biochemistry.

(There were many of us.)

But at one stage of my career:

I became the Grieve Lecturer in Physiological Chemistry.

A honorific position with a single occupant. The definite article is often omitted, so I could say:

I was Grieve Lecturer in Physiological Chemistry

But never “a Grieve Lecturer”.

Similarly in my university the two chairs (professorships) of biochemistry had specific titles, the Gardiner chair and the Cathcart chair. One might refer to someone as being “Gardiner Professor of Biochemistry” or “The Gardiner Professor of Biochemistry”.