Sampson has produced several short films and feature films and has strong experience in post-production. His early work includes LINK (2005) featuring Ben Mitchell (Shortland Street) and Shireen Shah (Jinnah) and FOUL PLAY (2006) which was a collaborative effort with Writer/Director, James Napier Robertson. Sampson produced with 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 Director/Writer Tim Tsiklauri's CRACKHEADS feature. The film was officially selected at the Oaxaca Film Festival, Mexico, and the Austin Film Festival in Texas. In 2013, CRACKHEADS won best self-funded feature film at the New Zealand Film Awards. 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.

As a lead producer, Sampson is currently in post-production on a feature-length documentary titled CHASING THE DREAM, the story of an independent Australian music producer who sets up a record label in the 1980s and then decides to head to LA. Sampson was an associate producer on Steven O'Meagher THE STORY OF RUGBY (2019), a six-part documentary series and producer on the feature film TURN OF THE SCREW (2020). The TOTS won the best editing and best picture at the Istanbul Film Awards, Best Horror Film at L'Age d"Or International Arthouse Film Festival and Chicago Indis Film Awards 2020.