The term of office of the commissioner is four years beginning July first of the year following the general election of the governor and ending June thirtieth of the fourth calendar year after appointment or until a successor is appointed and qualified. The commissioner may be removed for cause at any time during the commissioner’s term of office, by a vote of four or more board members. Upon vacancy by death, resignation, or removal, the board shall appoint a commissioner for the remainder of the four-year term.