bio at Wikipedia, he was born in 1928, so he would have been 13 at the time. So maybe this was just an early example of a fan who went on to work in the biz? Uh, no, I don't think so:
In 1947, after having written two comic-book scripts for DC Comics, he was hired as an editor at that Manhattan-based publishing company, where his brother, Bernard Kashdan, was a business executive who'd joined the company in 1940.(Italics added for emphasis)
Of course nowadays it is common for such contests to exclude employees of the company involved and their families.