Jaffe is credited for working on these games:
God of War II (2007), SCEA
God of War (2005), SCEA
Kinetica (2001), SCEA
Twisted Metal: Black (2001), SCEA
Twisted Metal III (1998), 989 Studios
Jet Moto (1996), SCEA
Twisted Metal 2 (1996), SCEA
Twisted Metal (1995), Sony Computer Entertainment Europe Ltd.
3 Ninjas Kick Back (1994), Sony Imagesoft
Mickey Mania (1994), Sony Electronic Publishing Ltd.
Cliffhanger (1993), Sony Imagesoft
Skyblazer (1993), Sony Imagesoft
I thought he was also involved in (but I may be wrong):
Critical Depth
Rogue Trip
Downhill Domination
So he does have a resume.