[rmc]

I remember reading about his hardware set up a few years ago and yes, he was using apple hardware.

It's almost certainly running linux though.

[zdw]

For a while there he was running Linux on a PowerMac G5 tower as his primary desktop:

https://lkml.org/lkml/2004/2/12/13

Many open source OS projects have core developers on non-x86/amd64 platforms so as to find errors, x86isms, and other code quality issues reveled by fundamental differences in the underlying architectures.

[pimeys]

Well, in the picture I can clearly see a Gnome 3 desktop (with the default wallpaper).