The Executive Committee on Economic and Social Affairs (ECESA) is chaired by the Under-Secretary-General for Economic and Social Affairs. Its membership comprises DESA, the regional commissions, UNCTAD, UNEP, UN-Habitat, UNODC, OHCHR, UNDP, OHRLLS and OSAA and also includes UNU and the research/training institutes INSTRAW, UNRISD, and UNITAR.