Cringely says here that he worked part-time at Apple for a few months as a graduate student: https://www.pbs.org/nerds/qa4.html . Mark Stephens was at Stanford at the time (he earned his master's in communication in 1979) so this lines up. I think it's entirely possible that Cringely/Stephens was in fact the 12th person hired by Apple, but didn’t get a formal employee number because he wasn't a full-time employee.
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Cringely says here that he worked part-time at Apple for a few months as a graduate student: https://www.pbs.org/nerds/qa4.html . Mark Stephens was at Stanford at the time (he earned his master's in communication in 1979) so this lines up. I think it's entirely possible that Cringely/Stephens was in fact the 12th person hired by Apple, but didn’t get a formal employee number because he wasn't a full-time employee.