Divya Nag leads the team at Apple that created ResearchKit, an open-source developer toolbox that piggybacked on the company’s HealthKit framework—which allows users to store and share health data—to allow doctors and researchers to create apps that make it easy to participate in medical research. There are now several dozens in play, including ones for autism, Parkinson’s disease, and even NFL–related concussions. With ResearchKit, researchers studying everything from autism to diabetes can collect data from tens of thousands of patients via phones, rather than limiting their studies to people who can physically get to their research facilities. Now, she’s bringing this data-sharing effort to the patient-physician relationship. Through Apple’s new CareKit tools, doctors can automatically alert outpatients when it’s time to take their medications or exercise—while patients can reciprocate with continual updates on their condition. Doctors and hospitals are already using CareKit apps to provide better care, staying in touch with post-surgery patients, and there are countless applications for monitoring diabetes, mental health, pregnancy, and more. Nag dropped out of Stanford when she was 20 years old to found Stem Cell Theranostics, a drug screening biotech, and StartX Med, the official medical innovation accelerator program for Stanford University and Stanford Hospital. She joined Apple in 2014.