Thanks for your question, Phoebe.
The Clerk and Serjeant-at-Arms have important roles in assisting the work of the House of Representatives. But they are not elected members of the House, so they can’t take part in votes. They work for the House.
Only the elected members of the House of Representatives are allowed to make decisions on proposed laws and other issues.
Like all parliamentary staff, the Clerk and Serjeant-at-Arms had to apply for their position and be successful at a job interview. They will usually have worked in other positions at Parliament House and have a lot of experience with how the Parliament works.