Aron Lehmann was born in Wuppertal in 1981. Growing up in Nördlinger Ries, he already experimented with film at the age of twelve. Following his high school graduation, he moved to Berlin and worked as line producer on feature film productions. He then successfully applied at the Hochschule für Film und Fernsehen "Konrad Wolf" in Potsdam-Babelsberg, where he studied in the director's class of Andreas Kleinert.

After completing several shorts during his time as a film student, Lehmann presented his first feature-length production at the 2012 Munich Film Festival: "Kohlhaas oder die Verhältnismäßigkeit der Mittel" relates the story of a chaotic film crew which tries to adapt the classic drama "Michael Kohlhaas". The film went on to win numerous awards, including the Filmkunstpreis at the Festival des deutschen Films in Ludwigshafen, the Audience Award at the Filmfestival Max-Ophüls-Preis and the Deutsche Schauspielerpreis for Best Ensemble.

Lehmann, who also directed a TV staging of the play "Hummel im Himmel" in 2012, next helmed the comedy "Highway to Hellas" which was released in Germany in November 2015 and won the Audience Award at the Busan International Film Festival in South Korea.

His feature film "Die letzte Sau" ("The Last Pig") premiered at the Munich International Film Festival in 2016. The film tells the story of an indebted Swabian peasant, who tours the province with his last sow and happens to become an icon of resistance against the agricultural industry. Lehmann's next film, "Das schönste Mädchen der Welt" ("The Most Beautiful Girl in the World", 2018), touched on a completely different topic: The loose adaptation of "Cyrano de Bergerac" focuses on a high school student writing hip hop songs and text messages to the school's most beautiful girl on behalf of a slightly dumb fellow student. At the 2018 Gilde Film Award and the 2019 Bavarian Film Award, "Das schönste Mädchen der Welt" was named Best Youth Film.

Together with Pola Beck, Lehmann directed the first season of the highly acclaimed, tragicomic Netflix-series "Das letzte Wort", starring Anke Engelke as a widow who discovers her passion for the profession of funeral orator. For the cinema, he directed "Jagdsaison" ("Hunting Season", DE/DK 2022), a remake of the Danish comedy "Jagtsæson" (2019), about the wellness weekend of three women that goes turbulently off the rails. He then wrote and shot the whimsical fairy-tale comedy "Was man von hier aus sehen kann" ("What You Can See From Here", 2022), based on the novel by Mariana Leky, bout an old villager (Corinna Harfouch) who foresees deaths in her dreams.