We started working on Expo because we knew it was way too hard to make and distribute mobile apps and there had to be a better way. We are working on a platform that makes it possible to create true, highest quality native apps, but with a development cycle that's as easy as building a website. You can try the product by going to https://expo.io on Android or iPhone.
The team is mostly engineers including the two founders, Charlie Cheever and James Ide. Charlie started Quora (http://quora.com/) and before that worked on Facebook Connect and Facebook Platform. James Ide worked on product and website infrastructure at Facebook.