The Walking Dead and Sandman creators took the 6th and 23rd positions on The Hollywood Reporter's chart, respectively.
[Left: Robert Kirkman / Right: Neil Gaiman]
Stephen King - who has himself contributed to comics including American Vampire - was placed at the top of the list. His writing has spawned hit films including The Shining, The Shawshank Redemption and Stand By Me.
The list also includes Hunger Games author Suzanne Collins, 50 Shades of Grey writer EL James, Game of Thrones scribe George RR Martin and Twilight creator Stephenie Meyer.
Kirkman zombie comic The Walking Dead has been adapted into a hit television series, which he writes and executive producers. His latest title Thief of Thieves is also being adapted by AMC.
Gaiman wrote the 2007 motion capture film Beowulf, and has had his books Coraline and Stardust adapted to the big screen. Disney is planning a film based on his Graveyard Book and HBO is planning to adapt American Gods into a television show.