I didn't know the same person was behind both Planescape: Tormentand Fallout 2, some of my favorite games of all time. Torment I actually played only recently (had only played Baldur's Gate 1&2 before) and absolutely loved it. So it's not even just nostalgia.
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
If you like this sort of content, I recently found Sandy Petersen (Call of Cthulu, Doom, Age of Empire, Halo) is extremely active on X. Lots of interesting tidbits about game design https://x.com/SandyofCthulhu