James S.A. Corey is the pen name used by collaborators [Daniel Abraham] and [Ty Franck].
The first and last name are taken from Abraham's and Franck's middle names, respectively, and S.A. are the initials of Abraham's daughter.
: https://openlibrary.org/authors/OL1427729A
: https://openlibrary.org/authors/OL7523472A