ScreenRant
Writing and voice-led video across film, TV, and entertainment. The most popular piece, a breakdown of Thanos's plan, still holds up in the comments. Multiple breakout videos across the Valnet network.
Work · 2010–Present
Content systems
at scale.
From convention floors to broadcast studios to the editorial engine of a 25-million-subscriber channel. Fifteen years of making content that ships, scales, and stays.
Press · Belfast Telegraph
Feature
The flagship chapter.
WatchMojo
2021–2024 · Lead Editorial CoordinatorEntered as a contractor writing and voicing content, grew into a strategic editorial role helping adapt the channel during a period of significant platform change. Developed retention systems, trend analysis frameworks, new content formats, and thumbnail strategy, while contributing as writer and voice actor across hundreds of published videos.
561+
Publicly credited videos
25M+
Subscribers reached
Billions
Impressions contributed to
Online media
Writing & narration.
Knowledgia
Long-running lead narrator from around 2016. Roughly 90% of the channel's output is voiced by Callum, across history, science, and culture content. One of the most sustained single-channel narration relationships anywhere.
CBR / CBR Saga
Writing, voice work, and co-hosting CBR Saga, a weekly pop culture podcast covering Marvel, DC, Star Wars, and film. One episode predicted the WandaVision storyline before the show aired.
Broadcast & press
Television, film, print.
BBC
CBeebies' Pablo: recurring character voices across Series 1 and 2, including Captain Sunscreen, Sanjay, Mr. Spaghetti, Race Cars 1 & 2, Volcano, and Pablo himself in the Do Your Best song.
S2E34 Sun Cream ↗
S2E36 Volcano ↗
IMDb ↗
Voice Actor
BBC / ITV
Researcher, production assistant, and runner roles across BBC Current Affairs, BBC Radio Ulster, and ITV productions including The Voice and The Voice Kids. Interviewed on BBC Radio Ulster about media and content creation in Northern Ireland.
Radio Ulster interview ↗
Production
Documentary
Sound recordist on The Ballymurphy Precedent, Unquiet Graves, and Killing Kelly.
Sound Recordist
Press
Featured in the Belfast Telegraph for work in Northern Ireland's screen industries.
Read the feature ↗
Feature
Currently
Consulting & ecosystem work.
Business Development and Marketing Lead at Galvia Digital, and running IoTBelfast: connecting Northern Ireland's technology community the same way NerdyNI connects its fandom one.
Transmission open
Need a system that ships?
Media strategy, editorial systems, format development. If it involves content at scale, it's familiar territory.