Marriage

The Adornos wed in 1937, after more than fourteen years of courtship. That courtship was for a significant amount of time conducted over long-distance; Karplus confided in their close mutual friend, Walter Benjamin, that this separation was the cause of much long-term emotional strain upon her.^[4]

Adorno's death

Amidst growing student protests in Frankfurt, Adorno died of a sudden heart-attack in August 1969. Gretel Adorno was the individual who wrote the following death notice in the Frankfurter Rundschau: “Theodor W. Adorno, born on 11 September 1903, died quietly in his sleep on 6 August 1969.” ^[5]: 1

Friendship with Walter Benjamin

Notably, she became close friends with the German Jewish philosopher, essayist, and cultural critic Walter Benjamin, whom their mutual acquaintance Siegfried Kracauer would later that year introduce to her then suitor, Theodor Adorno; at this point, 1923, Adorno was at that time still a university student at Johann Wolfgang Goethe University in Frankfurt. Karplus' only sibling, Liselotte, became the second wife of Benjamin's cousin, Egon Wissing who was a doctor.^[1]: 55 Gretel herself was in frequent contact with Wissing both before and after the Adornos wed in 1937 and soon after emigrated to the U.S.

The letters between Gretel Adorno and Benjamin suggest that their friendship was not only personal, but also professional. She often assisted him by critiquing drafts of his work, including his large project, Passagenarbeit (The Arcades Project). This work had led to professional tensions between Theodor Adorno and Walter Benjamin, due to the former's concerns over Bertolt Brecht's increasing influence over Benjamin's thinking, which Adorno believed betrayed his waning commitment to negative theology. Gretel Adorno wrote personally to Benjamin in 1934 regarding her "great reservations" towards Brecht's "often palpable lack of clarity," advising Benjamin to be cautious in that intellectual friendship.^[4] After Benjamin committed suicide in 1940, Gretel and Theodor Adorno worked to secure the publication of his works with Suhrkamp Verlag.^[6]

Stenography

Secretarial work

Her assistance in recording and editing the verbal and written drafts of Dialectic of Enlightenment was neither the first nor the last time she worked alongside Adorno and Horkheimer in their intellectual activities. From 1937, the year that Gretel married Adorno, she assisted on almost all initial drafts of Adorno's works, which were dictated to her and taken down in shorthand.^[1]: 160

Gretel was involved in all of her husband's intellectual endeavours. Whilst the couple were living in the United States during World War II, Adorno for the most part refused to write in English, which meant that Gretel was required to translate his works into English.^[9]: 117

Editing Aesthetic Theory

When Theodor Adorno died suddenly in 1969 without having finalised the manuscript of Aesthetic Theory, Gretel Adorno and Adorno's former student Rolf Tiedemann took up the task of bringing that document to completion and publication. They discuss in the Editor's Afterword how "Adorno’s metaphor for works of art applies literally to the last philosophical text on which he worked:

‘The fragment is the intrusion of death into the work. While destroying it, it removes the stain of semblance.’ The text of Aesthetic Theory, as it was in August 1969, which the editors present here as faithfully as possible, is the text of a work in progress; this is not the form in which Adorno would have published this book. Several days before his death he wrote in a letter than the final version ‘still needed a desperate effort’ but that ‘basically it is now a matter of organization and hardly that of the substance of the book.’ Of this substance, according to Adorno, ‘essentially everything is, as one says, all there.' ^[10]