Warren Girard Ellis is an English comic book writer, novelist, and screenwriter. He is best known as the co-creator of several original comics series, including Transmetropolitan (1997–2002), Global Frequency (2002–2004), Red (2003–2004)—adapted into the feature films Red (2010) and Red 2 (2013)—Trees (2014–present), and Injection (2015–present). Ellis is the author of the novels Crooked Little Vein (2007) and Gun Machine (2013), and the novella Normal (2016).
A prolific comic book writer, he has written several Marvel series, including Astonishing X-Men, Thunderbolts, Moon Knight, and the "Extremis" story arc of Iron Man, which was the basis for the Marvel Cinematic Universe film Iron Man 3 (2013). Ellis created The Authority and Planetary for WildStorm, and wrote a run of Hellblazer for Vertigo, and James Bond for Dynamite Entertainment. Ellis wrote the video games Hostile Waters (2001), Cold Winter (2005), and Dead Space (2008).