Die Zeit, NZZ am Sonntag, Frankfurter Allgemeine Sonntagszeitung and Titanic print his comics.

[3] Mahler draws for Austrian, German and Swiss newspapers, magazines and anthologies.

[12] Mahler produced several literary adaptations in comic form, including Alte Meister (after Thomas Bernhard's novel),[13] Alice in Sussex (based on Alice's Adventures in Wonderland)[13] and Der Mann ohne Eigenschaften (after Robert Musil's novel)[12] as well as adaptations in 2020 of James Joyce's Ulysses[13] and Finnegans Wake.

[13] In addition to his fictional stories, Mahler published Kunsttheorie versus Frau Goldgruber (Art Theory vs. Mrs. Goldgruber), Die Zumutungen der Moderne (The Impositions of Modernity), Pornographie und Selbstmord (Pornography and suicide), as well as Franz Kafkas Nonstop Lachmaschine (Franz Kafka's Nonstop Laughing Machine), as autobiographical comics in which he processes his sometimes absurd experiences in everyday life and in the comic scene.

[3] Mahler's style is characterised by an extremely reduced stroke[16] with which he captures cranky characters.