About Len Wein
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 for helping revive the Marvel superhero team the X-Men. Additionally, he was the editor for writer Alan Moore and illustrator Dave Gibbons' influential DC miniseries Watchmen. Wein's first professional comic story was 'Eye of the Beholder' in DC's Teen Titans #18 (Dec. 1968), in which he co-created, alongside Wolfman, Red Star—the first official Russian superhero in the DC Universe. Wein's first superhero work for Marvel was a one-off story in Daredevil #71 (Dec. 1970) co-written with staff writer/editor Roy Thomas. Wein and artist Bernie Wrightson created the horror character the Swamp Thing in The House of Secrets #92 (July 1971). Libra, a supervillain created by Wein and Dillin in Justice League of America #111 (June 1974), would play a leading role in Grant Morrison's Final Crisis storyline in 2008.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.