You might not recognize Sheryl Sandberg's name, but it's more likely than not that you've seen her work today; maybe even just before you read this article. Sandberg is the Chief Operating Officer of Facebook, second in the company only to Mark Zuckerberg. She's got a long and impressive history of working for major internet companies; prior to her move to Facebook, she was working as a Vice President at Google.
Sandberg is doubtless well paid for the work she does at Facebook, but her salary only accounts for a fraction of her total worth. She has stock in both Google and Facebook, periodically selling some to cash in and fund her own philanthropic endeavors. One of those endeavors is the 'Lead In' foundation, which is devoted to encouraging more women to succeed in the business world. That topic is dear to her heart - she's released several books on the subject.