Core Moodle developer since 2004, often blamed for performance tuning of code (v1.9, v1.4, v1.5) and servers, auth/enrolment plugins, MNET, PostgreSQL support and other trivia.
Since March 2008 I am working on getting the School Server for OLPC ready for prime time. My title @ OLPC is architect, but the job description is actually get it done. Whether it is drawing pretty high level architecture plans, working with on-the-ground teams on configuration or getting dirty with OS-level programming, I am there. Here is our XS roadmap.
Before this, I started the e-learning team @ Catalyst IT, a Moodle Partner, developing and customizing Moodle for tertiaries in New Zealand and around the world. A good part of the e-learning work was done under the NZVLE project, part of Eduforge.org (which is also one of my projects).
Catalyst IT also has a lot of experience in the enterprise sector and high-scalability installations, with hundreds of thousands of users and courses. The team has some great people. You will see them posting in the Moodle forums often ;-)
I also hack on other interesting projects:
My personal focus is on leading Linux-based development projects, using PHP, Perl, Apache, OpenLDAP, PostgreSQL, MySQL and a few other trinkets. At home, add books on media, psychology and postmodernism.
In my spare time (?) I do some volunteer work for the Open Source community, particularly Debian.