Raj Panjabi, the founder of Last Mile Health, has joined Chuck Slaughter, the founder of Living Goods, a nonprofit organization that has built a distribution platform for lifesaving products, for an announcement on Wednesday at the World Economic Forum Annual Meeting in Davos, Switzerland.

A coalition of partners from philanthropy and business are committing $50 million to support these two social entrepreneurs to deploy 50,000 community health workers to provide digitally enabled, door-to-door care to 34 million people.

Virgin’s Richard Branson, Jeff Skoll, the first president of eBay and founder and chair of the Skoll Foundation, and Christopher Hohn, the investor who set up the Children’s Investment Fund in London, and the ELMA Foundation, are pledging $50 million in a challenge grant to kick off a shared campaign to deploy 50,000 of these community health care workers to reach 34 million people across 6 countries. To unlock this commitment, Panjabi and Slaughter have to raise another $50 million from new sources over the next four years, making the pitch that new backers can double the impact of their investments. UBS, the wealth manager based in Switzerland, jump started the process when it announced the first major commitment toward this match: for every two dollars their clients give, the UBS Optimus Foundation will match that with a dollar, up to $10 million, meaning this could amount to $30 million total.