; and (B) be responsible for the administration of all official activities conducted by the Commission. (6) Removal The Chief of Staff shall not be removed for reasons other than by a majority vote of the Commission for cause on the grounds of inefficiency, neglect of duty, malfeasance in office, physical disability, mental incapacity, or any other condition that substantially impairs the performance of the responsibilities of the Chief of Staff or the staff of the Commission. (b) Staff (1) Additional personnel In consultation with the members of the Commission, the Chief of Staff may appoint and fix the pay of such additional personnel as are necessary to enable the Commission to perform its duties. Such personnel may be appointed without regard to the provisions of title 5, United States Code, governing appointments in the competitive service, and (subject to subsection (c) may be paid without regard to the provisions of chapter 51 and subchapter III of chapter 53 of that title relating to classification and General Schedule pay rates. (2) Requirements A person appointed to the staff of the Commission— (A) shall be a private citizen of integrity and impartiality