Doug Church - he's worked for Origin Systems among others, on classics game series such as Ultima, Thief and System Shock has been with Valve for some weeks now, triggering much, "Oooh, blimey, heck! What's Valve up to?" from the Internet.The original news came from Gama, to whom Valve's Doug Lombardi issued a clarification that Mr Church had been with his company for "a couple of weeks". Apparently Mr L' "was unsure what, if any, specific project the designer has been assigned to."
Prior to joining Valve, Doug Church had also worked at litigation hit EA on a canned project with Steven Spielberg.
Source:
Gama