On September 12-18 JCSDA and COSMIC jointly hosted the 10th meeting of the International Radio Occultation Working Group (IROWG) at UCAR Center Green in Boulder, Colorado. JCSDA’s Hui Shao, co-chair of IROWG, Ben Ruston, the OBS lead, and COSMIC’s director, Jan Weiss, formed the local organizing committee with the support team from UCAR.