Or. Admin. R. 648-030-0050 – Chairperson and Other Officers

(1) Annually, at the Commission’s budget hearing for the new fiscal year, the Commission shall elect from the commissioners a Chairperson, a Vice Chairperson, and a Secretary/Treasurer (collectively, "officers"), who shall serve until their successors are elected.
(2) Any officer may resign or may be removed as an officer by a vote of five of the commissioners. If any officer ceases to be a commissioner, the office shall be vacant and a successor shall be elected at the next meeting of the Commission.
(3) The Chairperson shall preside over all meetings of the Commission. The Vice Chairperson or Secretary/Treasurer shall act in lieu of the Chairperson when the Chairperson is unable to perform the duties of the office or while the office is vacant.

ORS 571.406(3) & ORS 571.423(19)

ORS 571.406(3), ORS 571.423(19) & ORS 571.406(9)