24. Mark Gehring

Propeller Health (formerly Asthmapolis)

Co-founder and president

Launched: September 2010

What We Like: Armed with mobile sensors snapped onto rescue inhalers that sync with their smartphones, millions who suffer from asthma have a shot at a better life. Where you are during an episode is key information, and the GPS device gives docs new and better tools and data, which prevents expensive visits to the hospital and even life-threatening attacks.

Bragging Rights: Backed by one of the most advanced clinical trials—500 patients—it’s one of the first mobile health apps to get FDA clearance. Serial entrepreneur Gehring has helmed three other startups in 3-D radiation treatment planning (Geometrics), medical imaging (UltraVisual) and software platforms for non-programmers (Sharendipity).  

25. Dave Grandin >



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