Ray Dalio is an American billionaire investor, hedge fund manager, and philanthropist. Wikipedia
Source: Mark Cuban's "books he's reading summer 2018" list.
Source: "It’s excellent." - Tim Ferriss
Source: Ray Dalio mentioned this book in his book, "Principles."
Source: One of Sam Altman's answers to "What are some of the best books you recommend for a young startup founder?"
Source: "A very smart and important book." - Fareed Zakaria
Source: "A fascinating, eye-opening read that will help you not just recognize your own unique gifts, but find the strength to challenge conventional wisdom to bring them to life." - Arianna Huffington
Source: "[I'm] totally part of his cult. Because I believe in that hero’s journey." - Darren Aronofsky
Source: "I recommended [this book to the Dalai Lama] (which I also recommend to you)." - Ray Dalio
Source: Kelly Starrett recommended this book in the "Tools of Titans" book.
Source: Ray Dalio mentioned this book on "The Tim Ferriss Show" podcast.
Source: On the "books read" section of Ev Williams' GoodReads profile.