Autodesk Vault has an 'Initial Approver' property but it would be more useful to have a 'Latest Approver' property, this could be used to map to the 'Checked By' or 'Approved By' properties in Inventor and used in title blocks and revision tables.
I understand the 'Created By' property gets populated by the person who releases the file but then if using the Job Processor the Job Processor's user account name will override the 'Created By' property, this is why a 'Latest Approver' will be much more useful that the 'Created By' property.