Section 7. The office of jury commissioner shall be composed of a jury commissioner and such staff positions as the jury commissioner, with the approval of the committee, shall find necessary for the implementation and administration of this chapter. The jury commissioner shall be appointed by the supreme judicial court for the term of five years. The salaries of all employees of the office, including the jury commissioner, shall be established pursuant to the classification and compensation plan applicable to employees of the supreme judicial court. The jury commissioner shall be the executive head of the office of jury commissioner.