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Discover LudwigThe phrase "principal author" is correct and commonly used in written English.
It refers to the main or primary author of a piece of writing, such as a book, article, or research paper. Example: The book was written by a team of experts, but the principal author was Professor Smith.
Exact(60)
The book's principal author was John Sommerfield.
Its editor and principal author was Maxim Gorky.
The principal author of "The Jerusalem Document" was Sari Nusseibeh.
(Not incidentally, he was a principal author of the Constitution).
Made available on request from principal author.
The coding was performed by the principal author.
ADK: Principal author, preparing the material, collecting and interpreting the data, writing the manuscript.
But Netanyahu is surely a principal author.
Principal author.
KLHH is the principal author.
AHA – principal author and investigator.
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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