Upon his return to Frankfurt, Adorno was involved with the reconstitution of German intellectual life through debates with Karl Popper on the limitations of positivist science, critiques of Heidegger's language of authenticity, writings on German responsibility for the Holocaust, and continued interventions into matters of public policy. As a writer of polemics in the tradition of Nietzsche and Karl Kraus, Adorno delivered scathing critiques of contemporary Western culture. Adorno's posthumously published "Aesthetic Theory", which he planned to dedicate to Samuel Beckett, is the culmination of a lifelong commitment to modern art which attempts to revoke the "fatal separation" of feeling and understanding long demanded by the history of philosophy and explode the privilege aesthetics accords to content over form and contemplation over immersion.