John Mark Reppion (born 1978) is an English comics writer. He is married to Leah Moore, the daughter of Alan Moore, and he has worked with both on the comic Albion. 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. Williams III. Since 2003 the majority of his comics work has been co-written with Leah, as Moore & Reppion. 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! magazine, is a frequent contributor to Hellebore (magazine) and is a contributing editor for The Daily Grail online. His fiction has been published in anthologies from Combustion Books, Ghostwoods Books, PS Publishing, Snowbooks, Swan River Press, and Vagrants Among Ruins. John has collaborated with various musicians, artists, and record labels including Waxwork Records, Library of the Occult Records, Heimat Der Katastrophe, Dean Hurley, Megadeth, Def Leppard, and Iron Maiden.

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