He joined Wētā FX in 2003 as a Creature Animator on The Lord of the Rings: The Return of the King. He has since worked on a slew of critically-acclaimed titles including King Kong, Avatar, The Adventures of Tintin, The Jungle Book and the Planet of the Apes trilogy. He was Animation Supervisor on Mortal Engines and Disney's Lady and the Tramp.
Dennis is also an experienced Previs Artist, a skill he developed early on his career while working on Discovery Channel’s Dinosaur Planet series. He has continued to hone this skill alongside his animation career, which has enhanced his creative understanding of framing and composition, pacing and cutting of a scene, and how characters can drive a story at a sequence level.
Dennis has been recognised with two VES Awards for Outstanding Animated Character in a Photoreal Feature for King Louie from The Jungle Book and Caesar from War for the Planet of the Apes.