Question: Which former editor-in-chief of Marvel Comics created the supervillain Juggernaut?

full_context: Document 1: Stan Lee's Mutants, Monsters &amp; Marvels: Stan Lee's Mutants, Monsters & Marvels is a 2002 American documentary film produced by Creative Light Entertainment consisting of an interview of Marvel Comics publisher Stan Lee by film director Kevin Smith. The two talk about Lee's life, his marriage with Joan Lee, the 2002 "Spider-Man" film, and Spider-Man comics. Lee refers to Marvel Comics character J. Jonah Jameson as "the version so many people had of me." The interview was filmed in February 2002 in Santa Monica, California at a comic book store. The result was a nearly two-hour-long film. The documentary was included in a four-disc release of the 2002 "Spider-Man" film.
Document 2: Juggernaut (comics): Juggernaut (Cain Marko) is a fictional supervillain appearing in American comic books published by Marvel Comics. The character, who first appeared in "X-Men" #12 (July 1965), was created by writer Stan Lee and artist/co-writer Jack Kirby. He is the stepbrother of Professor X.
Document 3: John Romita Sr.: John V. Romita Sr., often credited as simply John Romita ( ; born January 24, 1930), is an American comic-book artist best known for his work on Marvel Comics' "The Amazing Spider-Man" and for co-creating the character The Punisher. He was inducted into the Will Eisner Comic Book Hall of Fame in 2002.
Document 4: Stan Lee: Stan Lee (born Stanley Martin Lieber , December 28, 1922) is an American comic-book writer, editor, film executive producer, and publisher. He was formerly editor-in-chief of Marvel Comics, and later its publisher and chairman before leaving the company to become its chairman emeritus, as well as a member of the editorial board.
Document 5: X-Men: The X-Men are a team of fictional superheroes appearing in American comic books published by Marvel Comics. Created by writer Stan Lee and artist/co-writer Jack Kirby, the characters first appeared in "The X-Men" #1 (September 1963). They are among the most recognizable and successful intellectual properties of Marvel Comics, appearing in numerous books, television shows, films, and video games.
Document 6: Jean Grey: Jean Grey-Summers (born Jean Elaine Grey) is a fictional superhero appearing in American comic books published by Marvel Comics. The character has been known under the aliases Marvel Girl, Phoenix, and Dark Phoenix. Created by writer Stan Lee and artist Jack Kirby, the character first appeared in "The X-Men" #1 (September 1963).
Document 7: 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 8: Cable (comics): Cable (Nathan Summers) is a fictional character appearing in American comic books published by Marvel Comics, commonly in association with X-Force and the X-Men. The character first appeared as a newborn infant in "Uncanny X-Men" #201 (Jan. 1986) created by writer Chris Claremont, while Cable's adult identity was created by writer Louise Simonson and artist/co-writer Rob Liefeld and first appeared in "The New Mutants" #87 (March 1990).
Document 9: Absorbing Man: The Absorbing Man (Carl "Crusher" Creel) is a fictional supervillain appearing in American comic books published by Marvel Comics. He first appeared in "Journey into Mystery" #114, cover dated March 1965, created by writer Stan Lee and writer/artist Jack Kirby. Over the years he has played a part on several Marvel Comics crossovers such as the original "Secret Wars" and "Fear Itself".
Document 10: Gene Stone: After graduating from Stanford and getting his masters in English Literature from Harvard, Stone (b. 1951) joined the Peace Corps, where he spent two years in the Republic of Niger. Returning to his home state of New York, he then started a career as an editor. He began at Harcourt Brace, where he edited a wide range of books, including Patricia Bosworth’s biography of Montgomery Clift. He then worked at Bantam Books, where he helped launch its hardcover division by acquiring such books as Albert Goldman’s biography of John Lennon and Kareem Abdul-Jabbar’s autobiography. Next, he worked as a senior editor at "Esquire Magazine", editing authors ranging from Alan Furst and Bobbie Ann Mason to Michael Kinsley and Joel Kotkin. He then moved to Los Angeles, where he was West Coast editor of Simon and Schuster, a consulting editor at the "Los Angeles Times", and editor in chief of "California Magazine".
Document 11: 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 12: Cyber (comics): Cyber is a fictional supervillain appearing in American comic books published by Marvel Comics. The character is depicted usually as an enemy of Wolverine of the X-Men. Created by writer Peter David and artist Sam Kieth, he first appeared in "Marvel Comics Presents" #85 (September 1991), though his appearance was obscured by a trench coat and hat. He was first fully seen and named in "Marvel Comics Presents" #86 (September 1991).
Document 13: Stan Lee Media: Stan Lee Media (SLM) was an Internet-based creation, production and marketing company that was founded in 1998, filed for Chapter 11 bankruptcy protection in 2000, and ultimately dismissed from bankruptcy in November 2006. In its early years, the company created Stan Lee branded super hero franchises for applications in all media. Its 165-man animation production studio was based in Los Angeles from 1998–2001. It won the 2000 Web Award for the best Entertainment Portal on the World Wide Web, but the company failed in the same year and the corporate shell has been involved in numerous lawsuits in the years since. The company has been characterized as "a sleazy Internet start-up that could function as the poster child for the excesses of the turn-of-the-century era." Stan Lee himself has long since cut ties with the company.
Document 14: Stan Lee Meets Superheroes: Stan Lee Meets Superheroes was a limited Marvel Comics series in which comic book writer Stan Lee met one of the characters he has created in each issue. The series was written by Stan Lee himself and is used to celebrate his 65th year as a Marvel Comics employee. The series is marked for its tongue-in-cheek humor and the comic book characters' general dislike of Stan Lee. The series contains five issues in which Stan Lee meets Spider-Man, The Thing, Doctor Doom, Doctor Strange, and the Silver Surfer. Each issue also contained reprints of issues from each character's respective comic. An issue in which Stan meets Professor Xavier and Magneto was included with the DVD edition of "".
Document 15: Goodman, Lieber, Kurtzberg &amp; Holliway: Goodman, Lieber, Kurtzberg & Holliway is a fictional law firm appearing in American comic books published by Marvel Comics. The firm is commonly depicted in the pages of the "She-Hulk" comic books - named after Marvel Founders Martin Goodman, Stan Lee, under his birth name Stanley Lieber, and Jack Kirby, using his birth name Jacob Kurtzberg. Created by Dan Slott, senior GLK&H law partner Holden Holliway first appeared in "She-Hulk" #1 (May 2004), where he hired the titular heroine to be a lawyer for his law firm, but as Jennifer Walters.
ground_truth: Stan Lee