Butler was also involved with the Carnegie Endowment for International
Peace, serving as its president from 1925 to 1945. He used his friendship with
many world leaders, including Pope Pius XI, in pursuit of peace and
international cooperation, working to secure the 1928 Kellogg-Briand Treaty
outlawing wars. For this work he received the Nobel Prize for peace, jointly
with Jane Addams, in 1931.
Nicholas Murray Butler, as Robert A. McCaughey has stated in his 250th
anniversary history Stand Columbia, "was the dominant personality in
Columbia University's history in the first half of the twentieth century,"
serving as President from 1902 until 1945. He viewed the world, not merely
Morningside Heights, as worthy of his attention and considered himself the last
of America's "presidential" university presidents. Even though, according to
then university archivist Milton Halsey Thomas, Butler spent the last two years
of his life directing the selected pruning of his papers for posterity, they
still amount to 600 boxes of material and 315 volumes of newspaper clippings.