(a) An individual appellant may represent his or her interests before the Board; a corporation may be represented by one of its officers; and a partnership or joint venture by one of its members; or any of these by an attorney at law duly licensed in any state, commonwealth, territory, the District of Columbia, or in a foreign country. Anyone representing an appellant shall file a written notice of appearance with the Board.

(b) The Government shall be represented by counsel. Counsel for the Government shall file a written notice of appearance with the Board.