Ask HN: does Apple have any R&D center?

I always wondered if Apple has any kind of research and development center. Microsoft and Google have both big research departments where they work on programming languages, development tools, operating systems, usability, probably on hardware too. You can see them on conferences among representatives of universities.

What does it look like if we talk about Apple? I am sure they spend much time on design and usability. But acutally I have never heard of people that created OS X, iOS or those who are responsible for Objective C and related tools. I tried to google that but I did not find any interesting information. I do not now anybody who worked at Apple either.