born Jan. 8, 1867, Jamaica Plain, Mass., U.S.
died Jan. 9, 1961, Cambridge, Mass.
U.S. sociologist and peace activist.
She studied at Bryn Mawr College and taught at Wellesley College from 1896. She founded a settlement house in Boston and served on state commissions on industrial relations (1908–09) and immigration (1913–14). She lost her professorship in 1918 because of her opposition to U.S. entry into World War I. In 1919 she helped found, with Jane Addams , the Women's International League for Peace and Freedom. In 1946 she shared the Nobel Prize for Peace with John R. Mott (1865–1955).