Worth: $53 billion
Overall rank: #22
Scott, a published author of two novels, was married to Amazon founder Jeff Bezos for 25 years until 2019. As part of the divorce settlement, Bezos transferred 25 percent of his Amazon stake to MacKenzie, which represented 4 percent of the company. Scott signed the Giving Pledge in 2019 which encourages extremely wealthy people to contribute a majority of their wealth to philanthropic causes and donated $1.7 billion to 119 nonprofit groups.