The old studio head (Brian Raffel, up til 2006) seems to have retired as he isn't credited with anything past that point.
Looking at other major players a lot of them ended up at Human Head.
There's still a bunch of long-timers there including the Raffel brothers, Eric Biessman (creative director on Quake 4, Soldier of Fortune and Wolfenstein), Kevin Schilder (Jedi Knight) etc... Aside from the original Hexen guys splintering off to form Human Head and the 2008, 2009 and 2010 layoffs, they seem to have a pretty consistent team.
Apparently Activision owns the Hexen licence. I thought Zenimax acquired it during id's acquisition but according to the Edge of Chaos (Doom 3 Hexen total conversion) team that's not the case.
@ Sinatar. Brian Raffel's still there. Check their Facebook page or this interview from last year.
Thanks for the info.
I think I'm sadder now that I know the talent's still there she being used on Call of Duty. Also, uncredited work being a legal thing is such BS.