I've just watched the last three Developer Feature Series episodes which covered Phil Harrison, Julian Eggebrecht and Alex Ward.  If memory servers me correct, there was one several months ago featuring John Romero, or perhaps it was just an audio interview... I'm not entirely sure.

Anyway, if you could tell me where I could find past editions I would be grateful.  I looked in the 'Features' section of GameSpot but had no luck.  Thank you!