Okla. Stat. tit. 5A , app 1-A § 6.6
Within ten (10) days after receiving notice of the filing of a complaint, the Chief Master (or Vice-Chief Master if the Chief Master is absent or otherwise fails to act within such period) of the Professional Responsibility Tribunal shall select three members thereof to serve as a trial panel of Masters (hereinafter referred to as "Trial Panel"), two of whom shall be lawyers and one shall be a non-lawyer, to hear the complaint. The Chief Master (or Vice-Chief Master) shall further designate one of the two lawyer-members of the Trial Panel to serve as Presiding Master. Two of the three Masters shall constitute a quorum for the purposes of conducting hearings, ruling on and receiving evidence, and rendering Findings of Fact and Conclusions of Law.
Okla. Stat. tit. 5A , app 1-A § 6.6