a student of literature/in literature

[Hese]

Hello again,

I've been wondering for a while which preposition is appropriate after "a student/ a professor" + their field.

She's a professor of economics/ in economics.
She's a student of economics/ in economics.

I'd go for "of", but I've come across the preposition 'in' in a newspaper and now I'm confused. Are both versions correct?

Thank you so much for your kind help

 

[owlman5]

I agree with your preference, Hese. You might see "in" occasionally, but "of" is more common.

 

[manon33]

You have an expert or a lecturer or a post in a subject, but a student or a professor of it.

I cannot explain this difference.