Sound design
Original sonic identities, signature effects and detailed sound worlds designed to support character, atmosphere and story.
Freelance sound designer · London, UK
Sound design for film & television
BAFTA-winning and Emmy-nominated sound designer Martin Cantwell creates distinctive sound worlds for feature films, television drama and specialist productions.
Creative sound for screen
Sound with character.
At the heart of Martin’s work is a passion for recording original sonic elements and composing signature sound effects. These ingredients become a creative, sympathetic and distinctive soundtrack shaped around the story.
With more than three decades of experience and over 100 production credits, Martin brings detailed craft and an instinctive understanding of narrative to film, episodic television, commercials and specialist projects.
Sound effects editing
Precise and imaginative effects editing for feature films, episodic television and commercial productions.
Original effects recording
Purpose recorded source material that gives a production an individual, authentic and richly detailed sonic character.
Creative collaboration
Experienced collaboration with directors, supervising sound editors and post production teams, from early ideas through to the finished soundtrack.
The approach
From first idea to finished soundtrack
- Listen
Understand the story, tone, characters and creative ambitions of the production.
- Discover
Find, record and develop the sonic ingredients that will make its world feel distinctive.
- Shape
Edit and compose those elements with sensitivity to picture, performance, rhythm and emotion.
- Collaborate
Work closely with the wider sound and post-production team to serve the final soundtrack.
Selected productions
Sound design in action
- A Knight of the Seven KingdomsSound designer · Emmy nominated for Outstanding Sound Editing · HBO · 2026
- The WitcherSound effects editor and designer · Netflix
- House of the DragonSound effects editor and designer · HBO
- Casino RoyaleSound designer · BAFTA winner for Best Sound
- Baby DriverSound effects editor · Golden Reel nominee
- Kingsman: The Golden CircleSound designer · 20th Century Fox
Martin’s credits span major studio features, independent film, television drama, commercials and games. View the full credits and experience page
Recognition
Award-winning sound
BAFTA winnerBest SoundCasino Royale
Emmy nomineeOutstanding Sound Editing · 2026A Knight of the Seven Kingdoms
Golden Reel nomineeSound Effects and Foley · 2018Baby Driver
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