When Geoff Martha joined med-tech giant Medtronic in 2011 as senior vice president of strategy and business development, no one knew it had hired a future CEO. But in his eight years at the company, Martha’s had some big assignments. Most recently he was executive vice president and president of Medtronic’s Restorative Therapies Group, a division with more than $8 billion in annual revenue and about 14,000 employees. He takes the reins in late April with the pending retirement of CEO Omar Ishrak. Martha managed the integration of Medtronic with Covidien in 2015—a $50 billion acquisition—the largest med-tech merger in history.