Uber's first employee resigns after its IPO makes him a BILLIONAIRE

Uber's first employee, Ryan Graves, 36, who once served as the company's CEO, has stepped down from the board of directors shortly after the ride-sharing app's IPO made him a billionaire.  In less than nine years with Uber, Graves' net worth has skyrocketed to an estimated $1.4 billion. Graves owns 31.9 million shares in Uber stock. He officially became a billionaire on May 10 when the company went public at a valuation of roughly $75.5 billion.