Doom: Post-Mortem (John Romero & Tom Hall at GDC 2011)

Legendary game-developers John Romero and Tom Hall do a post-mortem on Doom at GDC 2011. They talk about the development of this classic FPS and you get to see a lot of pre-alpha and beta footage from the game. This is the whole post-mortem in one video, so sit back and get out the popcorn! Original source: