People

Max Horkheimer 1895-1973 - Germany

German philosopher. Co-founder (with Adorno and Marcuse) of the Frankfurt School, 

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Encyclopedia Entries

Max Horkheimer - Wikipedia

Horkheimer, Max. The Columbia Encyclopedia, Sixth Edition. 2001

Questions of 

Horkheimer proposed unification of abstract philosophy with social science in the practice of critical theory

Reading

Dialektik der Aufklärung (Dialectic of Enlightenment) (1947). 

Zur Kritik der instrumentellen Vernunft (Critique of Instrumental Reason) (1967), 

Eclipse of Reason (1974)

Critical Theory, tr. by Mathew J. O'Connell (Continuum, 1975)

Between Philosophy and Social Science: Selected Early Writings, tr. by G. Frederick Hunter, Matthew S. Kramer, and John Torpey (MIT, 1995)

Writing available on the net

The Culture Industry: Enlightenment as Mass Deception
Theodor Adorno and Max Horkheimer (1944)

Commentaries

Max Horkheimer: A Bibliography, ed. by Joan Nordquist (Ref. & Res. Serv., 1990).

Erratic Impact http://www.erraticimpact.com/~20thcentury/html/horkheimer.htm

Also see Douglas Kellner, 

Susana Raquel Barbosa.

Quotations