Vous êtes un chercheur’’ is correct?!

Question

‘Vous êtes un chercheur, spécialiste des conflits, pro de ce qu’on appelle le dialogue humanitaire.’ I get this text from a French programme ‘Pour Info’. Why it’s correct with breaking the rule of omitting the indefinite with professions?

Céline Pickard · Accepted Answer

Bonjour Zilin,
In my opinion, I don't think there should be the indefinite article with the comma.
Take a look at the examples below:
Vous êtes un chercheur spécialiste des conflits.
-> qualified ("spécialiste" is a sort of "adjective") so the indefinite article is used.
Vous êtes chercheur, spécialiste de conflits
-> describing a (bare) profession along with a comma so, the indefinite article is used (as you've learnt so far)
 
I hope this is helpful.
Bonne journée !