Section 7. The commissioner of insurance may appoint and remove, with the approval of the governor and council, a first deputy, an actuary, a research analyst, and a chief examiner and such additional deputies, examiners, assistant actuaries and inspectors as the service may require. In case of a vacancy in the office of commissioner, and during his absence or disability, the first deputy shall perform the duties of the office, or in case of the absence or disability of such first deputy, the deputy who has been longest in the service of the division. The commissioner may appoint and remove such clerical and other assistants as the work of the division may require. Such deputies, research analyst, examiners, actuaries, inspectors, clerks and other assistants shall perform such duties as the commissioner may prescribe; provided, that any person aggrieved by any finding, ruling or decision rendered upon a hearing authorized by law held before a person other than the commissioner, may, within three days, or such further period in any particular case as the commissioner may allow, after the filing of such finding, ruling or decision in the office of the commissioner, appeal therefrom to the commissioner who shall review the case and may modify, affirm or reverse such ruling, finding or decision.