(a) The words panel of arbitrators or panel in this Part shall mean: (1) a group of three attorneys chosen to serve as arbitrators by the arbitration commissioner pursuant to section 28.4 of this Part; or (2) a single attorney assigned by the arbitration commissioner, as the Chief Administrator of the Courts, (hereinafter denominated the Chief Administrator), shall designate from time to time in a particular county or court; or (3) a single arbitrator in the event the parties, by stipulation, provide for arbitration before a single arbitrator in those cases where a panel of three arbitrators otherwise is required.

(b) The term chairperson shall mean the attorney so designated by the arbitration commissioner pursuant to section 28.4 of this Part, or the single arbitrator.