The foundation explains on its website that its trustees divided the organization into two entities: the Bill & Melinda Gates Foundation (foundation) and the Bill & Melinda Gates Foundation Trust (trust). The foundation section, based in Seattle, US, "focuses on improving health and alleviating extreme poverty," and its trustees are Bill and Melinda Gates and Warren Buffett. The trust section manages "the investment assets and transfer proceeds to the foundation as necessary to achieve the foundation's charitable goals"—it holds the assets of Bill and Melinda Gates, who are the sole trustees, and receives contributions from Buffett.