Kumler is best known for his work as half of the postpunk/darkwave outfit Foxxxy Mulder, and has also released a handful of garage/punk tracks under the moniker Cosmic Bummer. As Kumler’s most recent project, Occult A/V officially debuted in 2021 with Nightworks, a series of three EP’s titled Slow Fade Into Oblivion, What Was Forgotten Is Now Alive, and Speculative Apocalypse. A fourth Nightworks installment, Ghost Pulse, was released in 2022.

Inspired by artists ranging from Pye Corner Audio, Burial, and Vatican Shadow to J Dilla and Madlib—as well as Carl Sagan’s astrophysics documentaries, the filmography of Adam Curtis, and the writings of Mark Fisher—the music of Occult A/V is equal parts cosmic and hauntological: the sadness of Burial combined with the futurism of Detroit techno. While tracks like “I’m Sorry That I hurt You” and “Sadness at the Edge of the Universe” evoke a deeply human sense of nostalgia, longing, and regret through chopped vocal samples and lush analog synth textures, other tracks, like the brutally bitcrushed “Corpses in Bloom” feel like cosmic horror put to music, a starkly anti-humanist soundtrack to the final implosion of the sun. Taken as a whole, the music of Occult A/V explores the relationships between human and the cosmic, as if to remind us that human history is nothing more—and our lives nothing less—than reverberations of the big bang.

In early 2022, Occult A/V released a single titled "Cosmic Utopia," a collaboration between Kumler's Occult A/V and Cosmic Bummer alter egos. Heavily inspired by Sun Ra, the track is a nearly 9-minute phantasmagoria of breakbeats, psychedelic guitars, and spacey synths, moving fluidly between abrasive noise collages, danceable funk-inspired beats, and sludgy drones. The track, alongside Occult A/V's "Fully Automated Luxury Remix," is the first in a series of releases titled Stems & Seeds. The project is conceived of as a collaborative, open-source approach to music production and, accordingly, each single released under the Stems & Seeds banner includes a full set of stems for others artists to remix, resample, and reuse as they see fit.

In addition to producing music, Kumler designs audio-reactive visuals, which are an integral component of Occult A/V’s live performances. As the name suggests, Occult A/V is conceived as something like an A/V club from beyond—an audiovisual experience both otherworldly and utterly human.