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 may employ a staff attached to the Office of the Secretary in accordance with the Code or the State budget. Each staff assistant in the Office of the Secretary in charge of a particular area of responsibility and each 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 the Office of the Secretary in accordance with the provisions of the State Personnel and Pensions Article. The Secretary may review any personnel action taken by any unit in the Department. The Secretary may delegate the power to approve any appointment or removal to the head or governing body of any unit in the Department.