; (B) one of whom is appointed jointly by the two appointing individuals under paragraphs (1) through (4) who are members of, or caucus with, the Republican party; and (C) each of whom has served as President, Vice President, Secretary of State, Attorney General, Secretary of the Treasury, Secretary of Defense, or Surgeon General. (6) One member, to serve as Chair of the Commission, appointed by simple majority vote of the 10 members appointed under paragraphs (1) through (5). (b) Criteria for appointment (1) In general Each member appointed to the Commission under paragraphs (1) through (4) of subsection (a) shall be a physician. Of the two members appointed by each individual under such paragraphs, one shall be a physician with a specialty in psychiatry. The Chair shall be either a physician or an individual appointed under paragraph (5) of subsection (a), or both. (2) Limitations A member appointed under subsection (a) may not, at the time the member is appointed or serving as a member on the Commission, be— (A) an elected official to any Federal, State, or local office; (B) an employee (as that term is defined in section 2105 of title 5, United States Code, including any employee of the United States Postal Service or the Postal Regulatory Commission)