Hi, thanks for your question
A Chief of Staff is not a parliamentary position. They are a senior staff position in a member of parliament’s office. 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 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.