CEO, Chairman, and President, IBM, 59
Rometty’s tenure at the helm of IBM hasn’t been easy: The tech behemoth recently issued its 17th straight quarter of declining revenue. But there are bright spots. In fiscal 2015, IBM’s “strategic imperatives” (a.k.a. businesses that are actually growing) accounted for 35% of IBM’s $81.7 billion in revenue—up from just 10% in 2010. At least some of that growth has come from acquisitions; Rometty has closed 25 in the past 18 months—a total spend of $9 billion. Several, such as Truven Health and Merge Healthcare, are in the health analytics space.