(a) Generally. Any person may appear before the commission or in a hearing in person or by authorized representative. The presiding officer may require a representative to submit proof of authority to appear on behalf of another person. The authorized representative of a party shall specify the particular persons or classes of persons the representative is representing in the proceeding.
(b) Change in authorized representative. Any person appearing through an authorized representative shall provide written notification to the commission and all parties to the proceeding of any change in that person's authorized representative. The required number of copies of the notification shall be filed in Central Records under the control number(s) for each affected proceeding and shall include the authorized representative's name, address, telephone number, email address, and facsimile number.
(c) Lead counsel. A party represented by more than one attorney or authorized representative in a matter before the commission may be required to designate a lead counsel who is authorized to act on behalf of all of the party's representatives, but all other attorneys or authorized representatives for the party may take part in the proceeding in an orderly manner, as ordered by the presiding officer.
(d) Change in information required for notification or service. Any person or authorized representative appearing before the commission in any proceeding shall provide written notification to the commission and all parties to the proceeding of any change in their address, telephone number, facsimile number, or email address. The required number of copies of the notification shall be filed in Central Records under the control number(s) for each affected proceeding.

Source Note: The provisions of this §21.5 adopted to be effective March 1, 2004, 29 TexReg 1868