Associé.
ETYM Latin collaborare to labor together; col- + laborare to labor: cf. French collaborateur.
1. An associate who works with others toward a common goal; SYN. cooperator, partner, pardner.
2. Someone who collaborates with an enemy occupying force; SYN. collaborationist, quisling.
A writer whose work is published in a newspaper or magazine or as part of a book.