Diggins held for a time the Chair in American Civilization at the L'Ecole des Hautes Etudes, Paris and was a visiting professor at Cambridge and Princeton University.
An obituary reported that Diggins "was "critical of the anticapitalist Left for seeing in the abolition of property an end to oppression" but also "critical of the antigovernment Right for seeing in the elimination of political authority the end of tyranny and the restoration of liberty."[REF] .