"[5] For his feature film Kumiko, the Treasure Hunter (2014), starring Oscar-nominated actress Rinko Kikuchi, which he directed and acted in, and co-wrote with his brother Nathan Zellner, he won a Best Director Jury Prize award at the 2014 Fantasia Film Festival.

In 2018, Zellner released Damsel, a black comedy Western starring Robert Pattinson and Mia Wasikowska and codirected and cowritten with his brother.

[7] The film tells the story of a pioneer on the American frontier seeking to rescue his would-be-bride from an apparent kidnapping.

The website's critical consensus reads, "The beautifully filmed Damsel injects the western genre with a welcome dose of humor and some unexpected twists, although its stately pace may frustrate impatient viewers.

[2] In 2022, IndieWire described the Zellner brothers as having two projects in development: an as-yet-untitled sasquatch film (later revealed to have been titled Sasquatch Sunset[9]) that would star Jesse Eisenberg as Bigfoot, and a science fiction film titled Alpha Gang starring Nicholas Hoult and Jon Hamm, about aliens deciding whether to invade Earth.