; (B) establishing the number of members described in subparagraph (A) that shall be required on a board of directors described in that subparagraph in order to avoid marginalization of the perspectives and contributions of those members; and (C) requiring each Regional Transmission Organization and Independent System Operator to designate at least 1 member of the board of directors of that Regional Transmission Organization or Independent System Operator who shall represent and be directly accountable, in such manner as the Commission determines to be appropriate, to the public interest within the geographic footprint of the Regional Transmission Organization or Independent System Operator. (f) Employment and compensation (1) Revolving door prohibitions (A) In general Not later than 180 days after the date of enactment of this Act, the Commission shall promulgate regulations requiring Regional Transmission Organizations and Independent System Operators to establish rules prohibiting the Regional Transmission Organization or Independent System Operator from employing, during the periods described in subparagraph (B), an individual who is or was an executive of a utility (commonly known as a revolving door prohibition ). (B) Periods described The periods referred to in subparagraph (A) are— (i) any period during which the individual is an executive of a utility