Sheryl Sandberg is the chief operating officer of Facebook. Sandburg was the first woman to serve on the Facebook board of directors and is the founder of Leanin.Org. As a billionaire and philanthropist, she's a woman who appears to "have it all," however, there's a reason she's been named one of the world's most influential people. Sandburg weighs in on the gender gap and invites both men and women to become part of the solution. Her bestsellers include Lean In (2013) and Option B (2017).