There is hereby established within the Office of the Legislature the position of Legislative Post Auditor, hereinafter referred to as the “Post Auditor”. The Post Auditor shall be appointed in the same manner as other employees of the Legislature. The Post Auditor shall be a person of extensive experience and recognized qualification in the field of governmental fiscal procedures and accounting. The Post Auditor shall receive such compensation as is determined by the Legislature, according to its rules, except that his compensation may be increased but not diminished during his tenure in the position.