Unfortunately he's not a Valve Linux hire but rather he's joined Frozen Sand. Frozen Sand is the company behind Urban Terror, one of the many ioquake3 open-source shooter games available for Windows, Mac OS X, and Linux.
In January when he left id Software, Bessett said he was joining a small gaming start-up in Texas that wasn't FPS or eSports related. Now, however, he seems to be onto Frozen Sand.
TTimo has shared on Twitter, "I played [Urban Terror] for several years. It's one of those few games that just 'feel right' to me."