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.