Brad Katsuyama, Wall Street Reformer

Brad Katsuyama's blood pressure levels were "out of control" and he decided to make a significant change in his life. The Canada native left his job at Royal Bank of Canada, began a regular meditation practice and started IEX, a stock exchange that took on predatory high-speed trading and was the subject of Michael Lewis' best-selling book, "Flash Boys: A Wall Street Revolt."