There is hereby established a panel of Masters to be known as the Professional Responsibility Tribunal, which shall consist of twenty-one members, fourteen of whom shall be lawyers who are Active Members in good standing of the Oklahoma Bar Association, and seven shall be non-lawyers. Provided, however, that said Professional Responsibility Tribunal may be increased in size by the Chief Master with the concurrence of the Board of Governors to a level adequate to effectively provide the trial panels necessary to prosecute all proceedings under these rules. That the additional panel(s) of Masters shall be appointed pursuant to the same conditions and restrictions as hereinafter set forth. For the purposes hereof, a non-lawyer is defined as a person who neither holds a law degree nor is licensed to practice law in any state, and no more than two of the non-lawyer members may reside in the same Congressional District. The lawyer members shall be appointed by the President subject to the approval of the Board of Governors. The non-lawyer members shall be appointed by the Governor of the State of Oklahoma. The members of the Tribunal shall have staggered terms, with five lawyer and two non-lawyer members appointed for initial terms of three years, five lawyer and two non-lawyer members appointed for initial terms of two years, and four lawyer and three non-lawyer members appointed for initial terms of one year. No member shall serve for more than two full terms. Vacancies shall be filled as provided above. If because of disqualifications in a particular proceeding, a hearing panel cannot be constituted, the Chief Master or Vice-Chief Master may request the appropriate appointing authority to appoint a member or members pro tempore to act in such matter.