In December 1916 Hibben, Theodore Roosevelt and other philanthropists including Scottish-born industrialist John C. Moffat, William A. Chanler, Joseph Choate, Clarence Mackay, George von Lengerke Meyer, and Nicholas Murray Butler purchased the Château de Chavaniac, birthplace of the Marquis de Lafayette in Auvergne to serve as a headquarters for the French Heroes Lafayette Memorial Fund, which was managed by Chanler's ex-wife Beatrice Ashley Chanler. When peace came he joined the League of Nations non-partisan organization, worked for disarmament and conciliation, and was one of the first signers of a petition advocating the canceling of all war debts. He was awarded the French "Légion d'honneur" in 1919.