I'm not a teacher, but I know when you write a profession you must put an indefini article like a or an ( example: an actor or a famous actor).
If you want to put defini article like "the", you can, if you have before talk to the work of this person ("the" is put when you speak for the second time of someone or something).
No articles (no "a" no "an" no "the") it's used for speak about meat for example: I like meat.
I hope my little explication will help you.
Have a nice day.
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