Sheryl Sandberg, whose net worth hovers around $1 billion, made her mark as Facebook's chief operating officer.
As COO, Sandberg oversees marketing, communications, HR, business development, and overseas sales at the social media giant.
She's also become famous for her bestselling book "Lean In: Women, Work, and the Will to Lead," published last year.
"Lean In" has also scored a movie deal from Sony Pictures.