A Canadian filmmaker known for his work in the horror genre, he began his career in the art department, contributing to the visual style of several films. He co-directed and co-wrote the cult horror film "The Void" (2016), which gained attention for its practical effects and intense atmosphere. Gillespie has also worked on projects with the film collective Astron-6, known for their unique blend of horror and comedy. His work often emphasizes strong visual storytelling and innovative effects.