She also wrote a best-selling book last year, "Lean In." She serves on the board of Walt Disney(DIS) and was previously a director of Starbucks(SBUX).
AmEx CEO and Sheryl Sandberg on 'Lean In'
But despite her accomplishments, the 44-year old Sandberg is not as wealthy as company founder and CEO Mark Zuckerberg.
The 29-year old Zuckerberg owns 426.3 million Facebook shares, worth nearly $25 billion. Two of Zuckerberg's former college classmates, Dustin Moskovitz and Eduardo Saverin, are also both billionaires due to their Facebook stake, according to the company's most recent filings.
Facebook(FB) shares closed Tuesday at $58.51, up about 4% for the day, although they were slightly lower in early trading Wednesday.