John Reppion and Leah Moore have co-writing credits on Wild Girl, a 6-part comic for Wildstorm with art by Shawn McManus and J.H.

Together they have scripted comics and graphic novels for the likes of 2000 AD, Penguin Books, Channel 4 Education, Dark Horse, DC Comics, Dynamite Entertainment, Electricomics, IDW, and Self Made Hero.

Moore & Reppion were consulting writers for some of the mysteries featured in Frogwares Games multi-platform adventure Sherlock Holmes: Crimes & Punishments, 2014.

In 2008 The History Press published 800 Years of Haunted Liverpool – John's weird history/paranormal guidebook to the city.

He has written articles for the likes of Fortean Times, the History UK website, the Crime + Investigation UK website, Dark lore, The Big Issue, SteamPunk Magazine, and Kerrang!