[165] Coolidge appointed C. Bascom Slemp, a Virginia Congressman and experienced federal politician, to work jointly with Edward T. Clark, a Massachusetts Republican organizer whom he retained from his vice-presidential staff, as Secretaries to the President (a position equivalent to the modern White House Chief of Staff).[103]
Perhaps the most powerful person in Coolidge's Cabinet was Secretary of the Treasury Andrew Mellon, who controlled the administration's financial policies and was regarded by many, including House Minority Leader John Nance Garner, as more powerful than Coolidge himself.[166] Secretary of Commerce Herbert Hoover also held a prominent place in Coolidge's Cabinet, in part because Coolidge found value in Hoover's ability to win positive publicity with his pro-business proposals.[167] Secretary of State Charles Evans Hughes directed Coolidge's foreign policy until he resigned in 1925 following Coolidge's re-election. He was replaced by Frank B. Kellogg, who had previously served as a senator and as the ambassador to Great Britain. Coolidge made two other appointments following his re-election, with William M. Jardine taking the position of Secretary of Agriculture and John G. Sargent becoming Attorney General.