Net worth: $18.4 billion
Industry: Hedge funds
Source of wealth: Self-made; Bridgewater Associates
Ray Dalio's hedge fund, Bridgewater Associates, is the biggest in the world, managing a portfolio of around $160 billion in global investments.
At the top of his industry and having amassed an enormous fortune, Dalio has more recently focused on giving away money and advice. He's taken the Giving Pledge, committing to donate the majority of his wealth to charity. He's also stared his highly coveted "investment secrets," albeit in an unorthodox manner for a hedge funder, in a 30-minute YouTube video. His 123-page, self-published manual on his principles of money management and leadership is also seen as somewhat of a bible among the investment world.
Dalio has always taken a radical approach to management, making everything he and his fund does completely transparent to employees. And it's worked well for him: Bridgewater, while sometimes viewed as "cultish," is one of the most coveted places to work in finance. Dalio has said that he attributes his success, in part, to reminding himself that history repeats itself and keeping track of the decisions he's made that didn't work.
To make sure that Bridgewater runs without him, he's recently stepped back from management responsibilities while still remaining active in the investment strategy.
Dalio recently sat down with Business Insider CEO Henry Blodget to discuss his new book, which breaks down the anatomy of credit crises throughout history.