Roger Slifer began his career as an assistant editor at Marvel Comics where he had a hand in editing all the titles they published at that time. He became their Special Projects Editor overseeing comic magazines such as the Rampaging Hulk and their Classics Comics line, in addition to movie adaptations. He also co-wrote The Defenders with David Anthony Kraft and other stories featuring The Avengers, The Fantastic Four, and Iron Man.
Shortly thereafter, Roger published one of comicdom's first Graphic Novels, Manhunter, The Complete Saga, a collection of stories featuring DC's popular character by Archie Goodwin and Walter Simonson.
From there, he went to DC Comics where he served as their first Sales Manager to the specialty comic book shops and also wrote The Omega Men, DC's first on-going title sold exclusively to comic shops. In that series, he co-created Lobo, the popular and infamous interplanetary bounty hunter. Additionally, Roger edited World's Finest, New Talent Showcase and a quality reprint series of Green Lantern/Green Arrow by Denny O'Neil and Neal Adams.
In the eighties and nineties, Roger worked for Sunbow Productions, first as a writer on the G.I. Joe series, and later as Sunbow's Supervising Producer of various shows including Transformers, Conan, Bucky O'Hare, My Little Pony, G.I. Joe Extreme, and Jem. In addition to his work on hundreds of hours of TV series programming, he was an executive story consultant on three theatrical movies: Transformers, G.I. Joe, and My Little Pony.
He was also the story editor for many series including Jem, G.I. Joe Extreme, and Streetfighter. In 2001 he co-produced the first season of Yu-Gi-Oh for 4KIDS Productions.
Roger has also written for many animated series including Jem, Bucky O'Hare, Conan, Spider-Man, Princess Tenko, G.I. Joe, and Robocop.
Most recently, he has worked as a writer and consultant in the videogames industry. He is also hard at work on many spec movie and TV scripts. And he has been approached to write a graphic novel based on World Champion Pole Dancer Felix Kane.