[3] Green taught political theory in the Government Department at Smith College from 1964–1998,[3] and was a visiting professor at the New School Graduate Center in New York from 2000–2009.

In addition to his academic work, he has been a frequent contributor to public policy journals and magazines on topics ranging from affirmative action to anti-Semitism.

[5] He has served on the editorial board of The Nation since 1978,[6] He was co-chair of the American Writer's Congress in New York in 1981, participated frequently in the Socialist Scholars Conference and its successor, the Left Forum.

In a further development of that criticism in "Science, Government, and the Case of Rand: A Singular Pluralism" (World Politics 1968, reprinted in American Democracy, ch.

2),[2]: 11–29  he pointed out that the story of the Rand Corporation's relationship to the theorists of nuclear deterrence gave lie to the conventional liberal pluralist notion that policy-setting in the U.S. was open to all would-be participants on an equal basis.

Since that time, his writing has depended both politically and methodologically on these two foundations: the problems of liberal pluralism and the confusion of ideology with philosophical argument.

His writing has ranged broadly across a variety of political issues, from advancing a feminist critique of mass culture (Cracks in the Pedestal: Ideology and Gender in Hollywood, 1998)[10] to arguing in favor of open borders (American Democracy, ch.

11),[2]: 199–204  he has argued that familiar defenses of social inequality are profoundly ideological and can only be overcome not by philosophy but by collective action (American Democracy, ch.