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

Context articles: Cyber (comics)
Juggernaut (comics)
Spider-Man: Turn Off the Dark
Symkaria
Stan Lee
Jan de Leeuw
Spider-Man: The Darkest Hours
Axel Alonso
J2 (comics)
White Tiger (Ava Ayala)

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).
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.
Spider-Man: Turn Off the Dark is a 2010 musical with music and lyrics by U2's Bono and The Edge, with arrangements and orchestration by David Campbell, and a book by Julie Taymor, Glen Berger, and Roberto Aguirre-Sacasa.
 The musical is based on the Spider-Man comics created by Stan Lee and Steve Ditko, published by Marvel Comics, as well as the 2002 film about the character, and the Greek myth of Arachne.
 It tells the origin story of the character, his romance with Mary Jane and his battles with the evil Green Goblin.
 The show includes highly technical stunts, such as actors swinging from "webs" and several aerial combat scenes.
Symkaria is a fictional Eastern European country appearing in American comic books published by Marvel Comics.
 The country was created by Tom DeFalco for the Marvel Universe.
 It is one of several fictional countries in Eastern Europe created for Marvel Comics.
 The fictional country is mostly known as being the home of Silver Sable and the Wild Pack team though it is used throughout the Marvel Universe.
 The country has appeared in issues of "Silver Sable", "Silver Sable and the Wild Pack", "The Amazing Spider-Man", "Thunderbolts", "Citizen V and the V-Battalion", and other comics published by Marvel Comics.
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.
Jan de Leeuw (born December 19, 1945) is a Dutch statistician and psychometrician.
 He is Distinguished Professor Emeritus of Statistics and Founding Chair of the Department of Statistics, University of California, Los Angeles.
 In addition, he is the founding editor and former editor-in-chief of the "Journal of Statistical Software", as well as the former editor-in-chief of the "Journal of Multivariate Analysis" and the "Journal of Educational and Behavioral Statistics".
Spider-Man: The Darkest Hours is a novel written by Jim Butcher featuring characters from the "Spider-Man" Marvel Comics created by Stan Lee and Steve Ditko.
 The book was first published by the Pocket Books division of Simon & Schuster on June 27, 2006.
Axel Alonso ( ) is an American comic book creator and former journalist, best known as the Editor-in-Chief at Marvel Comics, a role in which he has worked since January 2011.
 Alonso began his career as a journalist for New York's "Daily News".
 He later worked as an editor at DC Comics from 1994 to 2000, during which he edited a number of books published under their Vertigo line, such as "Doom Patrol", "Animal Man", "Hellblazer", "Preacher" and "100 Bullets".
 In 2000 he went to work for Marvel Comics as a Senior Editor, while there he edited Spider-Man and X-Men-related books before ascending to Vice President, Executive Editor in 2010, and Editor-in-Chief in January 2011, replacing Joe Quesada.
 He has also worked as a writer and inker.
J2 (Zane Yama-Marko) is a fictional mutant superhero appearing in American comic books published by Marvel Comics.
 He exists in "MC2", an alternate future timeline of the main Marvel continuity and is the son of the former supervillain Juggernaut.
 J2 is a member of the future incarnation of the Avengers, A-Next.
 J2 once had his own series, which lasted for twelve issues.
 He has made a few appearances in "Spider-Girl" (also set in the MC2 universe, starring the daughter of Spider-Man).
White Tiger (Ava Ayala) is a fictional superheroine from Marvel Comics created by Christos Gage and Tom Raney, first appearing in "Avengers Academy" #20 (December 2011).
 Ava is the fifth character to assume the mantle of White Tiger and is the younger sister of the first White Tiger, Hector Ayala as well as the aunt of Angela del Toro.