5 CFR 960.104 - Membership.
(a) Presidential Directive. The President has directed the heads of agencies to arrange for the leading officials of their respective agencies' field activities to participate personally in the work of Federal Executive Boards.
(b) Members. The head of every Executive agency shall designate, by title of office, the principal regional officer, if any, and the principal area officer or officers, if any, who shall represent the agency on each Federal Executive Board; and by name and title of office, the special representative, if any, who shall represent the head of the agency on each Federal Executive Board. Such designations shall be made in writing and transmitted to the Director, and may be transmitted through the Chairmen of the Federal Executive Boards. Designations may be amended at any time by the head of the Executive agency.
(c) Alternate Members. Each member of a Federal Executive Board may designate an alternate member, who shall attend meetings and otherwise serve in the absence of the member. An alternate member shall be the deputy or principal assistant to the member or another senior official of the member's organization.