Eric Lindstrom's stint as creative director at Crystal Dynamics. He's spoken out on some elements of Underworld's development before -- particularly with regards to its two DLC expansions -- but a postmortem published on Gamasutra features a complete account of his work on the game.
While Lindstrom points out many of the game's successes in terms of design and play mechanics, he admits that several unforeseen factors took a significant bite out of time that was initially set aside for polishing. Getting a shared technology base in place proved unexpectedly difficult, and "acts of god" seemed to target the team, tragically taking the life of the lead level designer during the first half of production.
Eidos may have expressed disappointment in Underworld's sales, but the now Square Enix-owned publisher is rumored to be at work on a new direction for the franchise, overseen by original Tomb Raider designer Toby Gard.