From the team page:
NationBuilder is the world’s first operating system for community. It combines your people database, website, and communication tools like email, text messaging, and social media all into one accessible and affordable software platform. Whether you’re an author, activist, small business owner, or politician, we provide the tools to build a community around whatever it is you were meant to do.
NationBuilder was founded in November of 2009 by CEO Jim Gilliam and launched in April of 2011. The company is located primarily in downtown Los Angeles, with field offices in Oakland, Toronto, Vancouver and Washington DC.