Sean Dague has been an Open Source developer for most of his professional life. He's worked on numerous Open Source projects over the years including SystemImager, OpenHPI, Xen, OpenSim, NFS Ganesha, and OpenStack.
He's a core reviewer on Nova, Tempest, Devstack, Grenade, and lots of smaller projects within OpenStack, and is serving on the OpenStack Technical Committee.
Sean has been an avid Linux and Open Source user and contributor going back to college days. He created the Mid Hudson Linux Users Group in 2003, and has been running a monthly Linux and Open Source lecture series there ever since, exposing hundreds of people to the joys of Open Source technology.