At not even 30, Nag is leading Apple’s special projects focusing on health. Nag’s team developed ResearchKit, an open-source app developer for doctors and researchers to share patient results and clinical data, and this fall it announced groundbreaking new tools for the Apple Watch: the Series 4 includes an emergency-response system, in case the wearer falls and doesn’t respond, and a medical-grade EKG heart-rate monitor. —Robin Marty
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