John Mark Reppion (born 1978) is a British 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, 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, Darklore, and Kerrang! 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.