Sociologo (Stornoway, Scozia, 1882 - New York 1970); prof. all'univ. di Toronto (dal 1915) e alla Columbia (dal 1929 al 1950), poi emerito; autore, tra l'altro, di Society, its structure and changes (1931); Economic reconstruction (1934); Social causation (1942); The elements of social science (1949); Democracy and the economic challenge (1952); The pursuit of happiness (1955); The nations and the United Nations (1959); Life: its dimensions and its bounds (1959); The challenge of the passing years; encounter with time (1962); Power transformed (1964).