There is created the State Retirement Systems Investment Panel, consisting of five members, one each appointed by the Governor, State Treasurer, Comptroller General, the chairman of the Ways and Means Committee of the House of Representatives, and the chairman of the Senate Finance Committee. The member appointed by the Governor shall serve as chairman. All members appointed to the panel must possess substantial financial investment experience. No person may be appointed or continue to serve who is an elected or appointed officer or employee of the State or any of its political subdivisions, including school districts. Members shall serve for terms of two years and until their successors are appointed and qualify. Vacancies must be filled for the unexpired term in the manner of the original appointment. Members shall serve without compensation, but may receive the mileage, subsistence, and per diem authorized by law for members of state boards, commissions, and committees.