Ginni Rometty, CEO, IBM

This Sunday is International Women’s Day. So all week Fortune is sharing stories of some of the world’s most powerful women in business. After a forty-year career at I-B-M, chief executive Ginni Rometty (Jenny roh-MET-tee) is stepping down this spring. Under her leadership the multinational tech company has acquired 65 companies and built a 21-billion-dollar hybrid cloud business.

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