Posted March 08, 2012
Gabe Newell is now officially a billionaire and the world's 854th richest person according to Forbes. His estimated net worth is $1.5 billion since he owns more than 50% of Valve, which itself is worth over $3 billion by conservative estimates.
http://www.forbes.com/sites/davidewalt/2012/03/07/valve-gabe-newell-billionaire/
http://www.forbes.com/sites/davidewalt/2012/03/07/valve-gabe-newell-billionaire/