A member of the Dewan Rakyat must be at least 18 years of age and must not concurrently be a member of the Dewan Negara. The presiding officer of the Dewan Rakyat is the Speaker, who is elected at the beginning of each Parliament or after the vacation of the post, by the MPs. Two Deputy Speakers are also elected, and one of them sits in place of the Speaker when he is absent. The Dewan Rakyat machinery is supervised by the Clerk of the House who is appointed by the King; he may only be removed from office through the manner prescribed for judges or by mandatory retirement at age 60.