Hi, thanks for your question
A Chief of Staff is not a parliamentary position. Chiefs of staff are not elected by the people, nor is there a parliamentary tradition of chiefs of staff, as there is with positions like the Serjeant-at-Arms or the Usher of the Black Rod.
A Chief of Staff is a senior position in a member of parliament’s office, but not every member of Parliament has a Chief of Staff. They are usually employed by members who have the heaviest workloads and the most staff to manage, such as the Prime Minister, Leader of the Opposition and the ministers.
Members of parliament may choose to employ a Chief of Staff and decide what responsibilities their Chief of Staff should have. Their job is to generally manage the member of parliament’s office, but the exact duties and responsibilities are decided by that member of parliament.