Bourgeois headed the French delegation to The Hague Peace Conferences in 1899 and 1907, where he promoted cooperation among nations. Member of the peace group of the French parliament. He was a member of the Permanent Court of Justice at the Hague from 1903. Bourgeois was among the initiators of the League of Nations and was appointed France's representative to the League in 1919, where he was elected president of the council. Bourgeois was an ardent spokesman for disarmament, international law and obligatory arbitration.