About Us Third Sector leads governments, high-performing nonprofits, and private funders in building evidence-based initiatives that address society’s most persistent challenges. As experts in innovative public-private contracting strategies, Third Sector is an architect and builder of the nation’s most promising Pay for Success projects. A 501(c)(3) nonprofit, Third Sector is supported through philanthropic and government sources, including a grant from the Corporation for National and Community Service’s Social Innovation Fund. Our team brings extensive experience in developing innovative financing and contracting across the public and private sectors. We are highly versed in managing projects with diverse groups of stakeholders, economic modeling, fundraising, and evaluation/data analysis. Third Sector has offices in Boston, MA, San Francisco, CA, and Washington, DC, and serves clients across the United States.