('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.
(..) that earlier this evening... Harry Potter was sighted in Hogsmeade. Now... should anyone... student or staff attempt to aid Mr. Potter? They will be punished in a manner consistent with the severity of their transcription, further more... Any person found to have knowledge of these events... (..)2011 Harry Potter and the Deathly Hallows: Part 2