Sandberg was brought into Facebook to help reign in CEO Mark Zuckerberg, and give the company more panache with investors and business partners alike. Sandberg inspired women to lead and succeed with her book "Lean In," which topped best-seller lists earlier this year. She provided her own theories about why there are so few women leaders in the workforce, despite achieving equality in education decades ago. In addition to some obvious workplace inequalities, Sandberg claims some women are less ambitious. The Harvard-educated Facebook exec is incredibly ambitious herself. She joined Facebook in 2008. Since then, Facebook has grown to a worldwide company, sporting 1.15 billion users as of the end of the second quarter. Sandberg has been instrumental in building out the company's advertising platform, leveraging her prior experience. She's helped transition the company into the social networking giant it currently is. Prior to joining Facebook, the D.C. native was the Vice President of Global Online Sales and Operations at Google. She also has ties to Washington, having previously served as chief of staff for the United States Secretary of the Treasury.