MCA made a post last year where he listed all of the New Vegas devs and whether or not they're still at Obsidian:
https://rpgcodex.net/forums/index.php?threads/has-your-opinion-of-obsidian-changed-after-avellone’s-revelations-and-deadfire.123110/page-5#post-5728891
52 out of 70 of the devs are not at Obsidian anymore (74%). The
18 devs still at Obsidian (bolded are my additions):
Still There: (~19 18)
Mikey Dowling - Producer
Matt Singh - Producer
Brandon Adler - Producer
Brian Menze - Artist, Interplay/Black Isle vet
Scotty Everts - World building lead, Interplay/Black Isle vet
Daniel Alpert - Character/weapons artist
Sean Dunny - Environment artist
Seth McCaughey - Animator
Shon Stewart - Animator
James Melilli - Environment artist
Anthony Rogers - Tester/additional animation
Adam Brennecke - Additional programming
Justin Bell - Sound designer
Dini McMurry - World building/additional area design, but disregard since she left Obsidian in June
Josh, obviously
Charles Staples - Lead area designer
Jesse Farrell (left, then came back) - Area designer
Jeff Husges - Area designer, Interplay/Black Isle vet
Jorge Salgado - Area designer
Leads - 3/7 (they no longer have the lead artist, lead programmer, lead animator, and lead writer)
Designers (excluding leads) - 3/15
Artists/animators/world builders (exc. leads) - 7/14
Programmers (exc. lead) - 1/14 (lol)
Writers (exc. lead) - 0/5 (but we all know that part already)
Not all of Obsidian worked on New Vegas, of course; for instance, I know that Tyson Christensen (the lead area designer on Alpha Protocol) didn't work on NV and he's still at Obsidian.