The New York Daily News reports Len Wein has died [nydailynews.com] at the age of 69:
Legendary comic book writer and editor Len Wein has died.
He was 69.
Wein helped revive the “X-Men” franchise in 1975 with artist Dave Cockrum, creating characters including Nightcrawler, Storm, Colossus and Thunderbird.
A year earlier, in “The Incredible Hulk” #180, he debuted Wolverine, who eventually joined the “X-Men” team in later years.
In the late ‘80s, Wein left Marvel for DC Comics, where he worked as a writer and later an editor.
His work included “Batman” and “Green Lantern,” as well as editing Alan Moore's and Dave Gibbons’ “Watchmen” and “Swamp Thing,” also by Moore.
I was surprised to learn just how tremendously prolific he actually was. Wikipedia has a thorough rundown [wikipedia.org] of his life and works.