5. Garrett Camp (36)
Net worth: $6 billion
Source of wealth: Uber technologies
As a post-grad student Gareth in 2002 founded StumbleUpon, a web-discovery tool and in 2007 sold it to ebay for $75 million. In 2009, the Canadian co-founded Uber, an online car-hire service. Uber’s services which dominates in major US cities has its operations active in 58 countries. The company is currently valued at $50 billion.
