David Speyrer was interviewed for his job at Valve on the day the original Half-Life went gold in late 1998. He started working there soon after, just as Half-Life 2 began its lengthy development. Since then, he's risen through the ranks from programmer to project lead.
Now, David talks CVG through some of the processes that led to Half-Life 2: Episode Two being the remarkable game it is.
(Warning: there may be spoilers ahead...)