Olof Johansson works on Linux for PowerPC at PA Semi. While he did play around with Linux back in the early 90's, he was away from it for many years and finally returned in 2003. Most of his contributions so far have been in the architecture-specific parts for PPC64.
Besides Linux, he's also poked around the kernel on NetBSD, FreeBSD and other operating systems.
In his spare time he enjoys working on old Volvos, occasionally also driving them.
Olof Johansson is presenting: