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J.J. Abrams is the “creator” of S.. J.J. Abrams came up with the concept for S. when he discovered a book on a bench outside LAX in which someone had left a note for the person who'd find it. All of the marginalia and loose material in S. was inspired by Abrams' reflections on the ways in which people can connect through books, more specifically a singular book in particular. J.J. Abrams approached Dorst by asking him what kind of story he'd want to create using a story within the margins of a book as a structural conceit. They then spent the better part of a year discussing the characters, motivations, story arcs, and other elements, while Dorst did a bulk of the actual writing1). Abrams' name goes first in the bibliographic entry for the book.
Abrams also produced another work, Bad Twin, which was supposedly written by a character on the show “Lost.”
Here is a Huffington Post article on S. and J.J. Abrams. Mentioned in this article is the word, “ephemera,” which I was unsure of the meaning to and so looked it up. When I did I also found out etymological and further history/background on this word and what Abrams says is stuck throughout the pages of S. This Wikipedia article on the word was helpful.