Fabian Nicieza is an Argentine-American comic book writer and editor who is best known for his work on Marvel titles such as X-Men, X-Force, New Warriors, Nomad, Cable, Deadpool and Thunderbolts, for all of which he helped create numerous characters, among them Deadpool, Domino, Shatterstar, and Silhouette.

The X-Men are a superhero team appearing in American comic books published by Marvel Comics. Created by writer/editer Stan Lee and artist/co-plotter Jack Kirby, the team first appeared in The X-Men #1. Although initially cancelled in 1970 due to low sales, following its 1975 revival and subsequent direction under writer Chris Claremont, it became one of Marvel's most recognizable and successful franchises. They have appeared in numerous books, television shows, 20th Century Studios's X-Men films, and video games. The X-Men title may refer to the superhero team itself, the eponymous comic series, or the broader franchise including various solo titles and team books such as the New Mutants, Excalibur, and X-Force.