FastCo Design:

From 1986 to 1997, isolated from the fray at One Infinite Loop, (Advanced Technology Group) engineers and scientists crafted breakthrough technologies like HyperCard, QuickTime, QuickTime VR, and Apple Data Detectors. These inventions–even if they don’t exist today in their original form–shaped how computers, smartphones, and even the web itself works today.

There was a very real concern after Jobs killed the ATG that the company would lose its edge. Happily, those of us who thought that were wrong.