Canadian filmmaker, genre screenwriter based in Los Angeles. Co-writing credits with frequent collaborator Adam Robitel include the psychological horror hit The Taking (2014), Paranormal Activity: The Ghost Dimension (2015) for Paramount Pictures, and an upcoming supernatural thriller for Sony produced by Sam Raimi.

On the television side, Heffernan and Robitel are developing an original horror series with Darren Aronofsky's Protozoa Pictures. Gavin is also known for directing experimental visual works, primarily timelapse, most notably featured in The Rolling Stones' 2015-2016 concerts, the 2016 Roger Waters tour, and Paul Simon's 2018 Homeward Bound Farewell Tour. An alumnus of McGill University and the American Film Institute, Heffernan first hit the independent scene by writing, directing and starring in his micro-budget feature film Expiration (2003).