The purpose of this Funding Opportunity Announcement (FOA) is to seek applications for a Consortium Administrative Core for the HEALthy Brain and Child Development (HBCD) Study. This FOA runs in parallel with companion FOAs that seek applications for linked (RFA-DA-21-020) and unlinked (RFA-DA-21-021) research sites and a single Data Coordinating Center (RFA-DA-21-023). It is expected that investigators, upon funding, will work jointly with NIH scientific staff to assist, guide, coordinate, or participate in project activities. The HBCD Consortium Administrative Core (HCAC) will be responsible for providing the organizational framework for the management, direction, and overall coordination of the national multi-site consortium. It will coordinate the interactions of the individual Research Project Sites and the HBCD Data Coordinating Center. The Consortium Administrative Core will include Administrative and Project Management Plans, and will also be responsible for managing collaborative activities such as the functions of an Expert Scientific Board and oversight of an internal Steering Committee. See Section I (Funding Opportunity Description) below for more information.