eminence grise

I learned that phrase today from this website- an artist named Jared Carter from Indianapolis, who is very talented, by the way. It is fascinating.

Here is the official definition:
eminence grise - (French) a person who exercises power or influence in certain areas without holding an official position; example: "the President's wife is an eminence grise in matters of education"

So I would like to call myself an eminence grise LOL