He's worked on an impressive number of great games. Prey, SW Kotor 2, Fallout New Vegas, Neverwinter Nights 2, Icewind Dale 1+2 and Alpha Protocol (ok, arguably great) jump out at me https://en.wikipedia.org/wiki/Chris_Avellone#Works
Anyone who overlooked Prey (as I did for years) but loves the Looking Glass Studios games and successors (Thief series, Deus Ex series, System Shock series, Dishonored Series): just get it an play it. Read nothing. Just play it. You won’t regret it.
Worth qualifying as Prey (2017). Somewhat related[1] to Prey(2006) which is also a great game. Chris did not work on the 2006 one.
[1]: it's complicated.
Yes, the 2017 one is what I mean.
I think the overlapping names might even be why I overlooked it. Didn’t realize it was a new game.
IIRC it was supposed to be a sequel for 2006 one at some point, but some development and name rights shenanigans happened.
When it was developed as a sequel, the story was completely different.
Also (to my mind) two of the most successful Kickstarted video game projects so far: Pillars of Eternity (a personal favorite) and Torment: Tides of Numenéra.
(He just needs to jump on a title like Numenéra: Into the Planescape to complete the cycle.)