Sociologo inglese (n. in Lituania 1889 - m. Londra 1970), prof. nella London school of economics dal 1929 al 1954, autore di Psychology of society (1921; 9a ed. riv. 1964), L. T. Hobhouse (1931), Sociology (1934), Moral progress (1944), Reason and unreason in society (1947), The idea of progress: a revaluation (1953), Essays on soci - ology and social philosophy (3 voll., 1956-1961), Nationalism: a re-appraisal (1961), On just ice in society (1965).