I know that collective nouns such as staff, team, crew, and family can get both singular and plural pronouns/verbs in different situations and contexts, but my question is only about staff when used to mean "a group of people who are personnel or employees of a same company."
When and why does staff get plural or singular pronoun/verb?
Best Answer
Staff is not different from other collective nouns: It takes a singular verb when it refers to the collection as whole, and a plural verb when it refers to the members of the collection taken individually.
That is for American English; in British English, collective nouns are generally regarded as plural.
See Collective nouns with singular verbs and plural pronouns.