Comex, the hacker creator of major jailbreaks as Spirit or JailbreakMe 2.0, He has announced that no longer works at Apple. A year ago Apple hired him as a scholar to deal with Security of iOS, seeing that it was an eminence of the jailbreak and it found holes in iOS on all sides.
Nicholas Allegra a.k.a. Comex says on Twitter that Apple sent an email to extend his contract as a scholar, but to him you forgot to reply to it, and why it does not work more for Apple. Some have interpreted this as that Apple has fired it, personally I do not understand as well, I guess that Comex has not shown interest to continue working there, because otherwise even if you forget to answer the email always you can discuss it later?
For my one of the best hackers who happened by the scene, and a pity, because after working at Apple specializing in the safety of iOS and knowing many secrets will not be able to engage in the jailbreak anymore. Let us hope that more figures like this out soon.