Jon Callas most recently worked as a co-founder of Silent Circle, which produced the security-minded Blackphone. He has two patents to his name from his second stint at Apple that focused on full-disk encryption. Callas is a veteran of the security industry who also co-founded PGP Corporation. His hiring comes as Apple continues to face pressure from governments wanting access to user data stored on iPhones. Apple didn’t respond to a request for comment when Callas was interviewed by Reuters.”]