staff member of a public facility
Refers to employees or personnel working at a public building such as a library, museum, community center, or similar institution.
When I asked a library staff member, I found the book right away.
A museum staff member gave me a detailed explanation of the exhibit.
legation staff; attaché
library clerk; librarian
Compound of 館 (kan, 'public building') and 員 (in, 'member' or 'personnel').