co-author

US /ˌkoʊˈɔː.θər/
UK /ˌkoʊˈɔː.θər/
"co-author" picture
1.

a person who writes a book, article, or other text with another person or people

:
She was the co-author of the groundbreaking research paper.
He worked with a co-author on his latest novel.
1.

to write a book, article, or other text with another person or people

:
They decided to co-author a book on sustainable living.
Professor Lee will co-author the next edition of the textbook.