Question: Leonard Norman Wein, was an American comic book writer and editor best known for co-creating DC Comics' Swamp Thing and Marvel Comics' Wolverine, and was the editor for writer Alan Moore and illustrator Dave Gibbons' influential DC miniseries "Watchmen", Watchmen is an American comic-book limited series published by DC Comics, in which years?

full_context: Document 1: Saturday Morning Watchmen: Saturday Morning Watchmen is a Newgrounds and YouTube viral video published on March 5, 2009, the day before the release of the live-action "Watchmen" film. The video parodies the DC Comics limited series "Watchmen" by Alan Moore and Dave Gibbons, claiming to be a clip from a 1980s Saturday morning cartoon based on the series. The video was animated, written, composed and sung by Harry Partridge and voiced by Partridge, Joshua Tomar, and Hans Van Harken. It pokes fun at the tendency of the campy nature of 1980s animation to sanitize superheroes and other violent themes. It features many of the mainstays of 1980s cartoon films, like catchy rock themes, and references to the openings of "Thundercats", "Teenage Mutant Ninja Turtles", "Jem", "The Legend of Zelda", and "Scooby-Doo". On the Newgrounds site, Partridge stated the video "combines two huge passions of mine, one being the comic genius that is Alan Moore and the other being kids' programming from the late '80s, which I would say is my biggest animation inspiration."
Document 2: List of Watchmen characters: "Watchmen" is a twelve-issue comic book limited series created by Alan Moore, Dave Gibbons, and John Higgins, published by DC Comics in 1986 and 1987. "Watchmen" focuses on six main characters: the Comedian, Doctor Manhattan, the Nite Owl, Ozymandias, Rorschach, and the Silk Spectre. These characters were originally based on the Mighty Crusaders and then reworked in an unsolicited proposal to fit superhero properties DC had acquired from Charlton Comics in the early 1980s. Series writer Alan Moore created the main characters to present six "radically opposing ways" to perceive the world, and to give readers of the story the privilege of determining which one was most morally comprehensible.
Document 3: Before Watchmen: Before Watchmen is a series of comic books published by DC Comics in 2012. Acting as a prequel to the 1986 12-issue "Watchmen" limited series by writer Alan Moore and artist Dave Gibbons, the project consists of eight limited series and one one-shot (though two were initially planned) for a total of 37 issues.
Document 4: Swamp Thing: The Swamp Thing (Dr. Alec Holland) is a fictional character and antihero in comic books published by DC Comics. He is a humanoid/plant elemental creature, created by writer Len Wein and artist Bernie Wrightson. Swamp Thing has had several humanoid or monster incarnations in various different storylines. He first appeared in "House of Secrets" #92 (July 1971) in a stand-alone horror story set in the early 20th century. The character then returned in a solo series, set in the contemporary world and in the general DC continuity. The character is a swamp monster that resembles an anthropomorphic mound of vegetable matter. He fights to protect his swamp home, the environment in general, and humanity from various supernatural or terrorist threats.
Document 5: Alan Moore: Alan Moore ( ; born 18 November 1953) is an English writer primarily known for his work in comic books including "Watchmen", "V for Vendetta" and "From Hell". Frequently described as the best graphic novel writer in history, he has been widely recognised by his peers and by critics. He has occasionally used such pseudonyms as Curt Vile, Jill de Ray, and Translucia Baboon; also, reprints of some of his work have been credited to The Original Writer when Moore requested that his name be removed.
Document 6: Production of Watchmen: Watchmen is a 2009 film based on the twelve-issue graphic novel series of the same name created by writer Alan Moore, artist Dave Gibbons, and colorist John Higgins, published by DC Comics between 1986 and 1987. The graphic novel's film rights were acquired by producer Lawrence Gordon in 1986. Many problems halted the adaptation's development, with four different studios and various directors and screenwriters being attached to the project through twenty years. In 2006, Zack Snyder, who at the time was filming 'another comic book adaptation', was hired by Warner Bros. to helm "Watchmen". Filming started in 2007, and following deals with two of the previous companies involved in the development—Paramount Pictures was responsible for international distribution rights after budgetary issues in 2004, resulting in a lawsuit by 20th Century Fox. Fox, which was already contacted by Gordon in 1987, received $1 million of the gross—the "Watchmen" adaptation was finally released in March 2009.
Document 7: Len Wein: Leonard Norman Wein ( ; June 12, 1948 – September 10, 2017) was an American comic book writer and editor best known for co-creating DC Comics' Swamp Thing and Marvel Comics' Wolverine, and for helping revive the Marvel superhero team the X-Men (including the co-creation of Nightcrawler, Storm, and Colossus). Additionally, he was the editor for writer Alan Moore and illustrator Dave Gibbons' influential DC miniseries "Watchmen".
Document 8: Watchmen (film): Watchmen is a 2009 American superhero film directed by Zack Snyder, based on the 1986–87 DC Comics limited series of the same name by Alan Moore and Dave Gibbons. It stars an ensemble cast of Malin Åkerman, Billy Crudup, Matthew Goode, Carla Gugino, Jackie Earle Haley, Jeffrey Dean Morgan, and Patrick Wilson. A dark satirical and dystopian take on the superhero genre, the film is set in an alternate history in the year 1985 at the height of the Cold War between the United States and the Soviet Union, as a group of mostly retired American superheroes investigates the murder of one of their own before uncovering an elaborate and deadly conspiracy, while their moral limitations are challenged by the complex nature of the circumstances.
Document 9: Swamp Thing (comic book): The fictional character Swamp Thing has appeared in five American comic book series to date, including several specials, and has crossed over into other DC Comics titles. The series found immense popularity upon its 1970s debut and during the mid-late 1980s under Alan Moore, Steve Bissette, and John Totleben. These eras were met with high critical praise and numerous awards. However, over the years, Swamp Thing comics have suffered from low sales which have resulted in numerous series cancellations and revivals.
Document 10: Watchmen: Watchmen is an American comic-book limited series published by DC Comics in 1986 and 1987, and collected in 1987. The series was created by a British collaboration consisting of writer Alan Moore, artist Dave Gibbons, and colorist John Higgins. "Watchmen" originated from a story proposal Moore submitted to DC featuring superhero characters that the company had acquired from Charlton Comics. As Moore's proposed story would have left many of the characters unusable for future stories, managing editor Dick Giordano convinced Moore to create original characters instead.
Document 11: Nightcrawler (comics): Nightcrawler (Kurt Wagner) is a fictional superhero appearing in American comic books published by Marvel Comics, commonly in association with the X-Men. Created by writer Len Wein and artist Dave Cockrum, he debuted in the comic book "Giant-Size X-Men" #1 (May 1975).
Document 12: Promethea: Promethea is a comic book series created by Alan Moore, J. H. Williams III and Mick Gray, published by America's Best Comics/WildStorm.
Document 13: Un-Men: The Un-Men are a group of fictional characters in the DC/Vertigo Comics universe. Created by the writer/artist team of Len Wein and Berni Wrightson, the Un-Men made their first appearance in 1972, in the first and second issues of the original" Swamp Thing" comic book series. The characters made subsequent appearances in later issues of "Swamp Thing" and its successor series, "Saga of the Swamp Thing," and in the 1994 five-issue Vertigo miniseries, "American Freak: A Tale of the Un-Men." In August 2007, Vertigo (DC's "mature readers line") launched "The Un-Men," a monthly comic book series chronicling the further exploits of these characters. Thirteen issues of that title were published.
Document 14: Albion (comics): Albion is a six-issue comic book limited series plotted by Alan Moore, written by his daughter Leah Moore and her husband John Reppion, with covers by Dave Gibbons and art by Shane Oakley and George Freeman. As a result of a deal forged by Vice-President Bob Wayne of DC Comics and Publishing Director Andrew Sumner of IPC Media, it was published through DC Comics' WildStorm imprint. The series aimed to revive classic IPC-owned British comics characters such as Captain Hurricane, Robot Archie, The Steel Claw and The Spider (as well as minor characters like Fishboy and Faceache), all of whom appeared in comics published by Odhams Press and later IPC Media during the 1960s and early 1970s, such as "Valiant" and "Lion".
Document 15: Wolverine (character): Wolverine (born James Howlett commonly known as Logan and sometimes as Weapon X) is a fictional character appearing in American comic books published by Marvel Comics, mostly in association with the X-Men. He is a mutant who possesses animal-keen senses, enhanced physical capabilities, powerful regenerative ability known as a healing factor, and three retractable bone claws in each hand. Wolverine has been depicted variously as a member of the X-Men, Alpha Flight, and the Avengers.
ground_truth: 1986 and 1987