Earlier quoted context omitted.
One of the most important people in the later development of X Window, also worked on other 2D drawing APIs. [ EDIT: I was wrong about X Window. Take back all the karma! ]
I was only tangentially involved in X, but was active in a lot of related projects (some Gtk infrastructure, Ghostscript, the seeds of what became Inkscape), and now work on GPU-accelerated font rendering. I also played a central role in getting Rust adopted at Google, and now one of my passions is advancing the Rust GUI space, as I feel like that has enormous potential.
:-)