A Collection Custodian is a person who is responsible for the care and maintenance of a collection of items. The term 'SITTER' is often used to refer to this type of position, as it involves watching over the collection and ensuring that it is kept safe and secure. The Collection Custodian is responsible for cataloging, organizing, and preserving the collection, as well as providing access to it when necessary. They may also be responsible for researching the items in the collection and providing educational programs related to the collection.