This grant supports the continued operation of the Secretariat of the Deep Carbon Observatory DCO). The Secretariat performs a series of invaluable coordinating and steering functions for the Deep Carbon Observatory as a whole, including conducting program management and oversight; organizing the DCO International Science Meeting and other scientific meetings; coordinating all components of the DCO to amplify its impact;  assisting with research synthesis, integration, and long?term planning; expanding and strengthening the DCO partnerships and intra-community interactions; promoting program development and leveraging of DCO resources;  facilitating further development of DCO-supported instruments and promoting their broad community use; engaging early-career scientists in the DCO; and reducing enterprise risks. Grant funds will support these and other activities of the secretariat as the DCO moves toward completion in 2019.