25. Ginni Rometty
Chairman, President, CEO
How does one go about drastically transforming a sprawling and iconic company that’s been a cutting-edge leader for more than a century? In Ginni Rometty’s case, with bold moves and a grand vision for a business environment dependent on intelligent computing. It’s not an easy process, but Rometty is fighting off the doubters as she looks to the future of IBM, the cloud and cognitive computing.