Documentary Filmmaker
Geologist turned filmmaker, following invisible supply chains to find the stories nobody's telling.
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Iona Horton is a British documentary filmmaker, born in Hong Kong and based in New York. She holds an MEarthSci in Earth Sciences from the University of Oxford and an MS in Journalism from Columbia University, where she specialized in documentary film.
Before picking up a camera, she spent seven years as a sustainability consultant, tracking how materials move through global supply chains and what happens when they reach their end of life.
Her work explores the invisible systems connecting humanity to the natural world - from the endangered wood inside every violin bow to the global butterfly trade nobody knows exists. She finds these stories the same way every time: a chance encounter reveals a hidden world, and she follows the thread.
She believes the environmental movement has been selling sacrifice for too long - that the sustainable future needs to be made so exciting, so beautiful, and so obviously worth building that people sprint toward it. Her films, writing, and public speaking are all in service of that vision.
She is a Pulitzer Center Fellow, the founder of Carsaig Productions, and has been invited to join the board of the International Pernambuco Conservation Initiative. Her film The Final Bow is a winner of the duPont / Judy F. Crichton Award, recognizing hard-hitting journalism and excellence in long-form narrative and visual storytelling.
Co-directed with Luisa Barone
Deep in Brazil’s Atlantic Forest grows pernambuco – a rare tree whose wood makes the world’s finest stringed instrument bows. The Final Bow follows master bowmaker Christophe Landon, celebrated cellist Coleman Itzkoff, and Brazilian conservationists caught in a fight over the fate of this tree.
The film weaves together the clash of international regulation, local conservation, and artistic necessity – a story about beauty, loss, and the invisible supply chains behind the things we love. It had its world premiere at the Big Sky Documentary Film Festival as a Top 10 Finalist for Best Short, and is a winner of the duPont / Judy F. Crichton Award for excellence in journalism and long-form visual storytelling.
Screened across North & South America
Now streaming free on Yahoo & YouTube as part of the Yahoo x Nonfiction Hotlist collection — watch the full film and share it.
Feature Documentary
The Butterfly Breeders
The global live butterfly trade and the communities and habitats it sustains.
Feature Documentary
Heartwood
The fight to save pernambuco and restore Brazil's Atlantic Forest.
Collaborations with award-winning filmmakers and production companies.
Manhood
Post-Production Coordinator
Feature documentary directed by Daniel Lombroso (formerly of The New Yorker), an Outerboro Films production in association with World of Wonder. World premiere in the Documentary Spotlight at SXSW 2026, with executive producers Fenton Bailey, Randy Barbato, Sheila Nevins, and Penny Lane. Praised by Variety, IndieWire, and The Hollywood Reporter.
Dispatches from a Foreign Body
Field Producer & Cinematographer
With filmmaker Eugen Bräunig and Houseguest Pictures — an Emmy-winning studio (14 News & Documentary Emmy nominations, three wins) behind Welcome to Chechnya (HBO), The Vow (HBO), Harry & Meghan (Netflix), and Light & Magic (Disney+).
The Loves of Emma Bardac / ArtMusic
Director · Editor & Creative Collaborator
Creative collaborator to Grammy Award-winning classical music producer Thomas Mowrey. Iona directed the ArtMusic series — landmark high-definition films pairing the music of Claude Debussy with restored and re-imagined Impressionist visuals — and is developing a museum exhibition built around the film and the story of Emma Bardac and her husband, the composer Claude Debussy.
Surviving Sandy Hook
Production Assistant & Researcher
Part of the award-winning BBC Two series This World, produced by True Vision TV. Over the course of a year, the film follows families of victims and survivors of the Sandy Hook shooting as they rebuild their lives — a story of grief, hope, love, and guns.
Looking After Mum
Production Assistant & Researcher
A BBC Children in Need special produced by True Vision TV, following brothers Tom (10) and Joe (14) as they care for their mother through a critical liver condition — one story among an army of unsung child carers across the country.
Micro Short
Harumi's Flowers
A Japanese couple balance creativity and happiness with the financial realities of their Brooklyn dried flower business.
Micro Short
Risking It All on a Requiem
A Brooklyn-based conductor risks bankruptcy to make classical music concerts popular with young people.
Top 10 Finalist · Best Short Documentary
One of the premier documentary festivals in the United States, held annually in Missoula, Montana.
Columbia University
Honors documentary work that encapsulates hard-hitting journalism, excellence in long-form narrative and visual storytelling, and historical perspective on issues concerning American culture.
Pulitzer Center on Crisis Reporting
A fellowship supporting impactful journalism and documentary work on underreported global issues.
Emerging Filmmakers Showcase
Washington DC’s premier festival dedicated to environmental storytelling and advocacy through film.
Nominated · Chronicles of the Land Competition
Chile’s international wildlife and environmental film festival, celebrating stories of conservation and the natural world.
Columbia University Graduate School of Journalism
Selected for Columbia's annual showcase of documentary work from emerging and established filmmakers.

Selected as one of 20 standout documentary shorts from nearly 1,000 submissions, now streaming to Yahoo’s global audience.
Watch & read →
The official announcement of the 20-film collection, featuring The Final Bow, directed by Iona Horton and Luisa Barone.
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Iona Horton named a Pulitzer Center Post-Graduate Reporting Fellow for the pernambuco documentary project.
Read more →For film inquiries, festivals screenings, community screenings, press, or collaborations - reach out below.