It Takes a Valley is a practitioner's guide to building entrepreneurial ecosystems, drawn from a decade of field research, podcast interviews, and on-the-ground conversations with more than fifty community builders across the United States (and a few beyond). It tells the human story of the connectors, conveners, and community champions who work behind the scenes to create the conditions for entrepreneurs to find support, build relationships, and grow businesses that strengthen local economies. Part narrative record, part practical field guide, it is the book the ecosystem building field has been waiting for.