I'm also curious about this. And, even moreso - did apple just start designing chips from scratch or did they buy someone who already had some cutting edge technology? Its hard to believe that they're beating everyone just out of nowhere...
A lot of those guys had a BBQ at my apartment complex for a celebration hosted by my roommate, who worked at Apple’s Silicon Team with them. Lots of cool things to talk to them about. This was around the time of the iPhone 7.