Sampson has produced several short and feature films and has substantial experience in post-production. His early work includes LINK (2005), featuring Ben Mitchell (Shortland Street) and Shireen Shah (Jinnah), directed by Paul Roukan. Sampson collaborates with Writer/Director James Napier Robertson and Tom Hern on the New Zealand feature film, I'M NOT HARRY JENSON. His role was producer, co-editor and Post-Production producer. The film was nominated for Best Supporting Actor and Best Film Under One Million at the Qantas New Zealand Film and Television Awards in 2009.

In 2012, Sampson edited and post-produced the feature film CRACKHEADS. The film was officially selected at the Oaxaca Film Festival, Mexico, and the Austin Film Festival in Texas. In 2013, CRACKHEADS won the best self-funded feature film at the New Zealand Film Awards. In addition, Sampson re-teamed with director Tim Tsiklauri on the Premiere short film RESTORATION (2015) (funded by the NZFC). Sampson was nominated for Best Editor for RESTORATION at the Academy Award-accredited Show Me Shorts 2015 Festival.

Sampson was associate producer on Steven O'Meagher THE STORY OF RUGBY (2019), a six-part documentary series and Producer and Editor on the feature film TURN OF THE SCREW (2020) that has picked up several awards around the world via the film festival circuit and had a limited theatre run in NZ.