D.C. Mun. Regs. tit. 15, r. 15-110
In any proceeding an individual, receiver, trustee, or official may appear in his or her own behalf, a member of a partnership may represent the partnership, an officer of a corporation may represent the corporation, a member or employee or an association or non-profit corporation may represent the association or non-profit corporation, and an official of a Federal, District or State Commission or other governmental agency may represent that Commission or governmental agency.
Any individual appearing before or transacting business with the Commission in a representative capacity may be required to establish authority to act in that capacity.
A person may be represented in any proceedings before the Commission by an attorney at law admitted to practice before the District of Columbia Court of Appeals; or by an attorney admitted to practice before the highest court of any state upon the granting by the Commission of a motion for special appearance; Provided, that the attorney does not maintain an office within the District of Columbia for the practice of law.
In any proceeding before the Commission, if a party is represented by more than one attorney or person, that party shall, at the time it first appears before or files with the Commission, designate which one of those attorneys or persons is authorized to receive service on behalf of that party. Service to that designated representative shall be considered to be service to all representatives of that party as well as to that party.
The Commission may disqualify, or deny, temporarily or permanently, the privilege of appearing or practicing before it in any way, to any individual who is found by the Commission, after hearing, either to be lacking in the requisite qualifications to represent others or in character or integrity or to have engaged in unethical, improper or unprofessional conduct. In particular, no person shall willfully mislead the Commission or its Staff by a false statement of fact or law.
Persons who appear in a representative capacity in any formal proceeding shall file a written notice of appearance with the Commission Secretary on the first occasion of appearance. The notice of appearance shall state the person's name, local address, local telephone number, e-mail address, and for whom the appearance is made. The written notice shall be part of the record.
D.C. Mun. Regs. tit. 15, r. 15-110