Lynne Doughtie

After three decades at KPMG in both the audit and advisory businesses, Doughtie became head of the professional services firm in July. KPMG’s 12% year-over-year revenue growth in the U.S.—to nearly $7 billion in fiscal 2014—makes it the fastest growing of the Big Four. In addition to overseeing more than 27,000 people, Doughtie leads KPMG’s efforts to boost the number of C-suite women.

For more on newcomers and returns to the list, read “Who's on? Who's off? Fortune's list of the Most Powerful Women has plenty of changes.”