Mahnert studied film production at the New York Film Academy and worked as a production assistant at Roger Corman's Concorde-New Horizons.

Mahnert returned to her native Switzerland, where she worked in distribution and programming at 20th Century Fox, Warner Bros., Pathé Cinémas, and Frenetic Films. She worked at Maximage Filmproduktion as a production assistant.

In 2012, she moved to Paris to join Celluloid Dreams, handling sales and acquisitions. Since 2013, she is working as a freelance producer, acquisitions consultant, and festival programmer and was hired in November 2013 as Foreign Representative for the Market & Festivals department at Swiss Films, the promotion agency for Swiss filmmaking.^[2]

Mahnert is a programmer at the Sitges Festival Internacional de Cinema Fantàstic de Catalunya and the Strasbourg European Fantastic Film Festival, and Director of Programming at Fantastic Fest in Austin, Texas. ^[3] In March 2020, Mahnert became the executive director at the Frontières Co-Production Market, an industry initiative for genre film professionals.

She is a consultant for the Zurich Film Foundation, the Cineforom in Geneva, and co-founded the European Genre Forum.^[4]

As a film producer, she worked on Mattie Do's The Long Walk (2019),^[5] Alexandre O. Philippe's documentaries 78/52: Hitchcock's Shower Scene (2017) and Memory: The Origins of Alien (2019), and other productions.

In 2022, she was selected as jury member in the "Filmmakers of the Present" competition category at 75th Locarno Film Festival.^[6]

Annick Mahnert is a member of the Swiss Film Academy and the European Film Academy.

• Annick Mahnert at IMDb