The artdealer who went to Supersnipe often is named Mitch Itkowitz and he runs an art/illustration store called graphiccollectibles.com
Thread on the connections between Jack Kirby books from the 60s & 70s (people mention 'The Fourth World' and 'Black Panther') and SW. [there's a large user post on the connections.] but here's the relevant Supersnipe info:
The Ronin Ro book Tales To Astonish contains several pages on the Lucas/Kirby connection. It first points out that at the time of Kirby’s 70′s Black Panther there were people who thought it was old fashioned or worse. The book then points out some of the close similarities in the basic premise of Jack’s Black Panther book and the Indiana Jones character which appeared a few years later. Boiled down this would be a hero who engages in adventures generated by a search for archaeological treasures.
The book also describes a dinner between Ed Summer owner of Supersnipe, his silent partner at Supersnipe George Lucas, and Roy Thomas. Lucas tried to pitch the idea of a Marvel comic book based on Star Wars (remember the comic book preceded the movie) without success to Thomas. Thomas is quoted as saying he wasn’t interested in Star Wars, but came away from the dinner believing that Lucas had been reading Kirby comics, “I don’t know if George Lucas ever quite admitted it, but I got the impression that there was a little influence there.”
The book then moves on to quote Mike Thibodeaux recalling Jack’s own feelings that a number of things had been borrowed ( Moonrider/Skywalker, Older mentor:Himon/Obi-Wan Ken-obi, Dark Side/Darkseid, Light saber/Mega-Rods, and quite a few more.) Kirby is quoted as saying he didn’t think the resemblances were great enough that he felt he was owed anything other than an acknowledgment from Lucas.
Here is that Ronin Ro (Marc Flores) book's 'Star Wars' sections:
More on the Kirby Lucas debate:
I especially enjoyed the part where Jack Kirby and George Lucas have dinner and Jack tells George about a new story he’s working on, the New Gods. He tells George about Mark Moonrider, the “religious presence” known as The Source, his Dark Father, children separated from fathers at birth and the clash between good and evil etc….the book provides many many more details on this. This lunch took place in 1971/1972…..5-6 years before Star Wars was released. I’m not trying to suggest Lucas ripped off Kirby’s idea but there is no doubt Kirby influenced his epic story heavily.
People magazine - 1977.07.18
"I'm an introvert. I don't want to be famous," explains Lucas. "I get nervous when people recognize me and say, 'I loved your movie.' " So George drives a 1967 Camaro, and his only indulgence is a co-interest in a modish Manhattan comic-book store, Supersnipe.