Keith R.A. DeCandido has a long history with Marvel characters in prose. From 1994 to 2000, Boulevard Books published a range of more than 50 Marvel novels and short-story anthologies, for which Keith served as the editorial director. Keith also contributed to the line on the writing side, penning short stories for the anthologies The Ultimate Spider-Man, The Ultimate Silver Surfer, Untold Tales of Spider-Man, The Ultimate Hulk, and X-Men Legends, and also collaborating with Jose R. Nieto on the novel Spider-Man: Venom's Wrath. In 2005, Keith wrote another Spidey novel, this one a solo book for Simon & Schuster entitled Down These Mean Streets.

This also isn't Keith's first foray into Norse myth, as he's written a cycle of urban fantasy stories set in Key West, Florida, featuring a young woman named Cassie Zukav who is a D?s, one of the fate goddesses, and has encounters in that island town with many folks from the Norse pantheon (including Thor, Loki, and Odin). Those stories can be found in the online zine Buzzy Mag; the anthologies Apocalypse 13, Bad-Ass Faeries: It's Elemental, Out of Tune, Tales from the House Band Volumes 1 & 2, and Urban Nightmares; and the short-story collections Ragnarok and Roll: Tales of Cassie Zukav, Weirdness Magnet and Without a License: The Fantastic Worlds of Keith R.A. DeCandido.

Keith's other work includes bunches of other tie-in fiction based on TV shows ( Star Trek, Supernatural, Doctor Who, Sleepy Hollow ), games ( World of Warcraft, Dungeons & Dragons, StarCraft, Command and Conquer ), and films ( Serenity, Resident Evil, Cars ), as well as original fiction, most notably the "Precinct" series of high fantasy police procedurals that includes five novels ( Dragon Precinct, Unicorn Precinct, Goblin Precinct, Gryphon Precinct, and the forthcoming Mermaid Precinct ) and more than a dozen short stories. Some of his other recent work includes the Stargate SG-1 novel Kali's Wrath, the Star Trek coffee-table book The Klingon Art of War, the Sleepy Hollow novel Children of the Revolution, the Heroes Reborn novella Save the Cheerleader, Destroy the World, and short stories in the anthologies The X-Files: Trust No One, V-Wars: Night Terrors, With Great Power, and The Side of Good/The Side of Evil.

Keith is also a freelance editor (working for clients both corporate and personal), a veteran anthologist, a professional musician (currently with the parody band Boogie Knights, one of whose songs is called "Ragnarok"), a second-degree black belt in karate (in which he both trains and teaches), a rabid fan of the New York Yankees, and probably some other stuff that he can't remember due to the lack of sleep. He lives in New York City with several folks both bipedal and quadrupedal.