The members of the board shall be appointed by the supreme court and commissioned by the governor for a term of 5 years and until their successors are appointed and qualified; provided, however, that any vacancy on the board shall be filled for the unexpired term. The initial members of the board shall serve staggered terms of 3, 4, and 5 years. The supreme court shall designate one member as chair to serve in that capacity for the duration of his or her term.