i was reading about the faces they used for the game, barney is played by the president of valve. dr. kleiner was some accountant one floor above the valve offices. there's a story about the development team that they were having lunch and spotted this accountant, and all these random programmers who didn't know the source for dr. kliener's face just couldn't figure out why he seemed so familiar...lol. oh, and colonel cubbage was some guy's martial arts instructor.