What do the little letters mean after some people's names in the credits?
Internet Filmmakers' FAQ
The letters after some peoples' names generally notates membership of a professional society for their chosen craft area. More often than not, membership of these societies is by invitation only, so they are very prestigious. You can generally assume that if a person is a member of one of these societies, they have made a substantial contribution to their area of specialisation.
Casting Directors
C.S.A - Casting Society of America
Cinematographers
A.S.C - American Society of Cinematographers
A.C.S - Australian Cinematographer's Society
B.S.C - British Society of Cinematographers
C.S.C - Canadian Society of Cinematographers
A.F.C - Association Française des Directeurs de la Photographie Cinématographique (France)
Editors
A.C.E - American Cinema Editors
Sound Technicians
C.A.S - Cinema Audio Society (Sound Mixers)
M.P.S.E - Motion Picture Sound Editors (Sound Editors)
Producers
p.g.a - Producers Guild of America