With the approval of the Governor, the Secretary shall appoint a Deputy Secretary. The Deputy Secretary: is in the executive service of the State Personnel Management System and serves at the pleasure of the Secretary; is entitled to the salary provided in the State budget; and has the duties provided by law or delegated by the Secretary. The Secretary shall appoint 1 or more budget analysts. The budget analysts shall: continually conduct studies of all budget expenditures of units of the Executive Branch of the State government; make recommendations to the Secretary for greater efficiency and economy in those units; and perform any other duties that the Secretary assigns. The Secretary may employ a staff in accordance with the State budget. Each assistant secretary and professional consultant is in the executive service, management service, or is a special appointment in the State Personnel Management System and is appointed by and serves at the pleasure of the Secretary. Except as provided in this section or otherwise by law, the Secretary shall appoint and remove all other staff in accordance with the provisions of the State Personnel and Pensions Article. The appointment or removal of staff of any unit in the Department is subject to the approval of the Secretary.