Engelbert, a 30-year Deloitte veteran, made history in March when she became the first woman to be named CEO of a Big Four firm in the U.S.  Deloitte is the largest professional services firm in the nation, with $14.9 billion in revenue and 70,000 employees; Engelbert plans to hire 25,000 more in 2016. Before getting the CEO nod, the former college basketball star served as head of Deloitte LLP’s audit subsidiary.

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.”