Worked from the frozen poles to the tropical equator, specializing In immersive imagery of dynamic and fast-moving animals and events. Worked on projects for National Geographic, Disney Films, Netflix, and the BBC, including Blue Planet 2 and Our Planet. He owns and maintains a Red Helium 8K and Red Dragon 6K Underwater Imaging System and is CCR TRIMIX and CAVE qualified. Worked for BBC Natural History on the Nature's Great Events series directed by Hugh Pearson and began his apprenticeship under cameramen Didier Noirot and Doug Anderson. During this period, he narrated and co-directed three documentaries with Craig and Damon Foster. "Into the Dragon's Lair" was nominated for an Emmy for best Cinematography in 2010, and the sequel, 'Touching the Dragon," was selected as one of the feature shows for National Geographic's 125th centenary year celebrations. Roger was also nominated for Best Narration at Jackson Hole in the blue-chip sequence for John Downer's "Earthflight" for producer Rob Pilley. Roger had completed a long-term assignment from John Downer to film bottle-nose dolphins for the "Spy in the Pod" series. These documentaries were aired on BBC One in 2013, and two sequences on the BBC Atlantic series for producer Ted Giffords 2010. Spent 110 days filming for Silverback Films on Disneynature's "Blue" for director Keith Scholey and worked as a second unit DOP on the National Geographic "Into the Okavango" feature directed by Neil Gelinas. He was appointed as the underwater DOP on the National Geographic Pristine Seas Expedition to Tristan da Cunha, led by Paul Rose, working for producer Alex Verville.
For Blue Planet 2, Horrocks received cinematography credits on four of the six main episodes, shooting for producers Jonathan Smith, Katheryn Jeffs, and Joe Steven. For his contribution to the series, he was awarded a BAFTA for Outstanding Cinematography in 2018.
He worked for producer Hugh Pearson on the Coastal Seas and High Seas episodes of the Netflix original series “Our Planet,” produced by Silverback Films. He won a nomination alongside cameraman Jamie McPherson for Outstanding Cinematography for a Nonfiction Program at the 2019 PrimeTime Emmy Awards in Los Angeles. He was one of two Underwater DOP’s hired by Jonathan Smith of the BBC Natural History Unit to shoot underwater screensavers for Apple TV. He is working on an ocean series for Netflix. He was the director of photography on “My Octopus Teacher,” which won the Best Documentary Feature in the 93rd Oscars Award (2021).