I work on Ubuntu kernel doing hardware enablement. I make sure that your laptops and desktops works well with Ubuntu. I have worked on the Ubuntu kernel since Jaunty Jackalope (9.04). Before working on Ubuntu kernel full time I worked on Linux on PowerPC and Linux in general for over 10 years.
I am also a Linux (Ubuntu) evangelist, I helped people of all ages 8 to 80 year olds, non-English speakers, computer illiterate, etc, make a smooth transition to Linux based operating systems (Ubuntu/Debian).