Cultore di storia economica (Chicago 1899 - Washington 1988), figlio del precedente, prof. nell'univ. di Chicago (dal 1936 al 1950), dal 1961 presidente del Center of human understanding. Opere princ.: The rise of the British coal industry (2 voll., 1932), Industry and government in France and England, 1540-1640 (1940), The United States and civilization (1942), War and human progress (1950), The birth of industrial civilization and the contemporary world (1954; trad. it. 1968), Cultural foundations of industrial civilization (1958), A search of civilization (1962), Bridges of human understanding (1964), The United States and civilization (1967), Search for meaning autobiography of a non-conformist (1973).