D.C. Mun. Regs. tit. 17, § 3129
3129
REPRESENTATION
3129.1 A respondent may be represented only by an attorney who is an active member of the District of Columbia Bar, except that the Director may permit an attorney who is an active member of the bar of another jurisdiction in the United States to represent a respondent in a particular case.
3129.2 If it appears to the Director that the issues or facts in a matter before him are so complex that the interests of justice, saving time, or facilitating the development of an adequate record would be served by the representation of a party by an attorney, the Director may request, but not require, that the party obtain an attorney and may allow a reasonable period of time to do so.
3129.3 An attorney shall not represent any person in a hearing until the attorney submits a signed statement containing the attorney's name, street address, telephone number, and bar number.
Source: Final Rulemaking published at 39 DCR 7853, 7869 (October 23, 1992).