CEO and President, Enterprise Holdings, 55
As the CEO of Enterprise Holdings, whose Enterprise, National, and Alamo brands make up almost half of America’s rental-car market, Nicholson is the travel industry’s top woman. A 34-year Enterprise veteran, she became the company’s first nonfamily CEO in 2013. Since then she’s both grown the U.S. business and expanded overseas, boosting revenue 18% to a projected $19.4 billion this year. Up next? A deal with Nissan to bring its car-sharing business to millennials via 90 college campuses.