Ray Dalio is an American billionaire investor, hedge fund manager, and philanthropist. He is the founder of Bridgewater Associates, one of the largest and most successful investment firms in the world. Dalio is known for his unique approach to investing, which he calls "principled decision-making," and for his belief in the power of radical transparency and open communication. He is also known for his work on economic principles, which he outlines in his book "Principles: Life and Work." In addition to his work in finance, Dalio is also a philanthropist and has supported various causes, including education and environmental conservation.