Since graduating from the National Film & Television School in 2018, Seymour’s work has featured in projects for Netflix, BBC Film, Microsoft, Tate Britain, and The National Gallery.

Recent film highlights include scoring Mdhamari Á Nkemi's multi-award-winning sci-fi Original Skin & sound-designing Jess O'Kane's comedy horror Hey Sexy!, slated for release in 2026.

His podcast work includes composing for the true-crime series Crypto Kingpins & co-composing the music for occult horror series The Sisters: Undertow, nominated for Best Original Music Score at the 2024 Webby Awards.

Also a prolific composer & sound designer for contemporary dance, beginning with James Cousins’ Within Her Eyes— winner of Matthew Bourne’s New Adventures in Choreography Award—Seymour has since collaborated with acclaimed choreographers Ihsan Rustem, Tony Adigun & Laura Obiols.

Recent projects include mixing Nichola Bruce’s feature documentary Some Things I Know About My Mother—an intimate portrait of visionary artist Jacqueline Stanley—and creating the music and sound design for the children’s theatre production The Ballad of Red & The Wilding Wolf, commissioned by the Bright Foundation, East Sussex.

Seymour is currently composing the score for The Last Puppet Show, a feature documentary exploring the life of his father - poet, puppeteer and post-punk icon Ted Milton.