This is a modified GTA2 PC credits list. I have added twitter links for some of the developers. I would like to add contact details and photos/avatars of everyone but it's hard to track them down and get permission.
allgame and mobygames have lists that show other games these developers have worked on. They seem to have lost it now but thegamingliberty.com had a 2011 interview with Colin Anderson, Grant Middleton, Stuart Ross, Raymond Usher, Brian Baglow and Paul Mackie (they all worked on GTA1 and some of them also worked on GTA2).
A ROCKSTAR PRODUCTION OF A DMA DESIGN GAME
Gary Penn wasn't listed in the credits but I'm told he did the main GTA2/GTA1 voice over.
GTA2 LEAD PROGRAMMER
ADDITIONAL SOUND EFFECTS
BONUS LEVEL DESIGN
MULTIPLAY LEVEL DESIGN
FRONT END DESIGN