He is a noted comic book writer who is best known for his long run from the 1970s to early 1990s on "The Uncanny X-Men" and related titles for Marvel Comics which became the most popular series for the company.
Created (or co-created) the X-Men characters Dazzler, Longshot, Rogue,
Mystique, Mojo, Destiny, Pyro, Avalanche, Kitty Pryde, Sebastian Shaw,
Phoenix and Legion, among others. Claremont was also key in
re-engineering the histories of most of the other major X-Men
characters, most notably Wolverine, whom he and artist Frank Miller recast
as a man of honor (a quasi-samurai) instead of a beserker, and Magneto
(by introducing the backstory that the young Magneto was a Holocaust
survivor.)
In reality good guys sometimes do not win and people die. And that has to be part of their lives otherwise it just becomes a video game... life isn't like that. And I always thought, my thought was the stories we tell in comics shouldn't be like that either. If there is risk for the reader, then the victory is that much sweeter. And you can, something can happen that can catch you by surprise and can have that much power and heart.