There was a member named Big Shady who worked at EA I believe. I don't think he posts much anymore, if at all. If I remember right he also said his mother used to work in the industry. I think he mentioned it in a video about the Angry Videogame Nerd because he was talking about the Spiderman game on the Atari 2600 and said his mom worked on it.
I may have imagined that last part.
Dan Elektro was a member here, and I think he was the the EIC of GamePro at one point.
I know a while back somebody posted on the member picture thread a pic of him and his co workers at Iguana.
and I dont' know if it counts but former editor of gamefan (ECM) was a member of this site, I don't know if he still is, but he's one of the main reasons i entered the forum officially back in 01 (i talked to him once on the chat back then)
I work at WMS (formerly Williams) as a game designer. Also worked at EA Chicago for a bit doing audio transcription for Def Jam Icon (ugh).