Jason Sizemore is an American writer and editor based in Lexington, Kentucky. He is the owner and managing editor of Apex Publications. He was the editor and publisher of Apex Digest, a quarterly science fiction and horror digest that ran for 12 issues between 2005 and 2008. As the publisher/managing editor of Apex Magazine, he was nominated for the Hugo Award in the semiprozine category in 2012 and 2013. As a writer he has published several stories in genre magazines.