Marvel Comics
In 1961, penciler Jack Kirby and writer-editor Stan Lee began revitalizing comics with the superhero team the Fantastic Four. The team's first two issues were published without formal creator credits, in the manner of times, and their inker has never been definitively established. Before the mid-2000s and the maturity of comics scholarship, inking credit for the landmark issues The Fantastic Four #1–2 (Nov. 1961 – Jan. 1962) was generally attributed to Dick Ayers, a frequent Kirby inker before and after. Since that time, further scholarship has given tentative credit to Klein. The standard Grand Comics Database, for example, unequivocally credits Klein as the primary inker (with possible alterations by Sol Brodsky) based on the analysis of Michael Vassallo and Nick Caputo.[5] That database credits Klein as inker for issue #2 with the caveat, "Inking often attributed to Dick Ayers and occasionally to Art Simek. The credit given reflects the current consensus."[6] Another standard reference, the Unofficial Handbook of Marvel Comics Creators, gives "George Klein?" as inker for issue #1 and "Sol Brodsky? George Klein?" for #2, with the additional note, "On the letter page of Fantastic Four (I) #272 and #281, Sol Brodsky is said to be the inker of this issue."[7]
Regardless, Klein was working almost exclusively for DC Comics during this time, known as the Silver Age of Comic Books, until DC's 1968 shakeup (see above). Klein then became one of Marvel's most high-profile inkers in the short time before his death. He embellished John Buscema on a run of The Avengers; Gene Colan on issues #46-49 off that penciler's signature series, Daredevil; and, in his last assignment, Jack Kirby on Thor #168–169 (Sept.-Oct. 1969).[4] Among the Silver Age issues he inked were the Avengers stories that introduced the Vision, Yellowjacket (Hank Pym), and the Clint Barton Goliath, and another with the marriage of Hank Pym and the Wasp, Janet Van Dyne; "Brother, Take My Hand" in Daredevil #47 (Dec. 1968), cited by Stan Lee as one of his favorites among the comic-book stories he wrote; and the cover and interior of one of Barry Windsor-Smith's first U.S. comic books, Daredevil #51 (April 1969).