February 11, 1945
San Diego, US
|Alma mater||London Film School|
|Occupation||Film and television director, producer, screenwriter, actor|
|Awards||Oulu International Children's and Youth Film Festival Starboy Award|
Originally brought up in Chicago, he moved to Britain in 1966 to study at the London Film School, and has spent the majority of his career in the UK.
He started making documentaries for British television in 1970, including the first filmed version of J. G. Ballard's story Crash!. He later graduated to making feature films, serving as second unit director on The Empire Strikes Back before helming films like Battletruck, Black Moon Rising, and Malone. He wrote and directed the 1988 horror film Dream Demon. He has directed episodes of various television series, including The New Adventures of Robin Hood, CI5: The New Professionals, and Xena: Warrior Princess.
- Six Reels of Film to Be Shown in Any Order (1971) – assistant director
- The Battle of Billy's Pond (1976) – director and writer
- The Glitterball (1977) – director and writer
- That Summer! (1979) – director
- The Empire Strikes Back (1980) – studio second unit director
- Warlords of the 21st Century (1982) – director
- Black Moon Rising (1986) – director
- Malone (1987) – director
- Dream Demon (1988) – director and writer
- Pilgrim (2000) – director and writer
- Paris Connections (2010) – director
- Crash! (1971) – BBC short film based on J. G. Ballard's The Atrocity Exhibition
- Hercules: The Legendary Journeys (1994–95) – director; 3 episodes
- Xena: Warrior Princess (1995) – director; 1 episode
- The New Adventures of Robin Hood (1997) – director; 3 episodes
- The Ruby Ring (1997) – director; television film
- CI5: The New Professionals (1999) – director; 2 episodes
- Dark Knight (2000) – director and writer; 2 episodes
- The Immortal (2001) – director; 2 episodes
- An Angel for May (2002) – director; television film
- The New York Times
- Film, British Council. "British Council Film: Harley Cokeliss". film.britishcouncil.org. Retrieved July 6, 2018.
- "Harley Cokliss". BFI. Retrieved July 6, 2018.
- Baxter, John, Chapter 34, "The Nasty", The Inner Man: The Life of J.G. Ballard, Hachette, 2011.
- Chibnall, Steve; Petley, Julian (2002). British Horror Cinema. Routledge. p. 6.