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.
Neverwinter nights 2 was awesome I recall having lan parties with that game
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.)