On Aug. 1, 2011, Roni Zeiger, MD, realized he was the only conscious patient in the neuro-ICU. “I just got a free pass,” he thought. “What should I do with it?” That night, he decided to quit his job and revolutionize health care.

For most of his life, Hugo Campos felt his heart do strange things. It jumped. It skipped beats. Too much coffee, he figured. Not enough rest. One morning in 2004, he ran to catch the subway and blacked out.

In late 2011, Doug Kanter made an unconventional New Year’s resolution: for the next year, he’d track every single data point related to his Type 1 diabetes. Every blood sugar reading. Every insulin dose. Every piece of pizza. Every workout. He’d track his location. He’d upload his photos. And then he’d revolutionize the way diabetes was managed.