('US') There are 100 people 'on staff'. [=working as members of the staff]
The department 'is staffed' with an equal number of men and women.
He has been 'on the staff' [=a member of the staff] for 25 years.
(..) like there's a thorn in his side. - A thorn? - It won't come out! What's that? He has a thorn? Hmm. - Get the staff down there. - Huh? - Step on it! Listen to me. That's no stink spirit we have on our hands. (..)2001 Spirited Away