agency head
(2) the term “agency head” means— (A) in the case of the executive branch of Government or an agency of the legislative branch other than the House of Representatives or the Senate, the head of the respective agency; (B) in the case of the judicial branch of Government, the chief judge of the respective court; (C) in the case of the Senate, the President pro tempore, in consultation with the Majority Leader and Minority Leader of the Senate; and (D) in the case of the House of Representatives, the Speaker of the House, in consultation with the Majority Leader and Minority Leader of the House;