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The phrase "a certain authority on" is correct and usable in written English.
It can be used when referring to someone who has specialized knowledge or expertise in a particular subject or field.
Example: "Dr. Smith is considered a certain authority on climate change and its effects on global ecosystems."
Alternatives: "an expert in" or "a recognized specialist in".
Exact(1)
It is simply the idea of one man: the maverick writer, thinker, conceptual artist and former rock star Bill Drummond, whose history as a member of the early-'90s band KLF gives him a certain authority on the subject of artistic self-denial.
Similar(59)
And, since his background is in news, he can bring a certain authority to his duties -- as an informed V.J. on MTV might do.
"One of the few advantages of age," she writes, "is that you can report on it with a certain authority; you are a native now, and know what goes on here".
The advantage of this method is calculations based on government and relevant organizations' formula, which has a certain authority.
It had a certain authority.
After death Hatcher still retains a certain authority and cachet.
He didn't know exactly what she did, but thought she manifested a certain authority.
"As an actor, I do have a certain authority," Ms. Taylor said.
Unlike "sarcastic" or "snarky," which imply a certain authority, "sassy" suggests impudence.
Ms. Argento addresses the international show-biz demimonde with a certain authority.
"But he had this arrogance about him, a certain authority, even when he was 19.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com