Julie Walters’ Raremark creates a safe place online for people with rare diseases.

It helps patients and families find the most credible medical knowledge and share experiences with other people like them.

It’s also a marketplace for pharmaceutical companies to find patients in an ethical way and give them the opportunity to join clinical trials.

See more of our 51 Health Tech Pioneers here.

And check out our other lists, including Start-Up 101, Tech 1sts and 101 Female Founders.