The ESSIC Aerosol/Cloud Physics/Radiation Affinity Group (ACPRAG) held its second annual workshop this month. The day-long ESSIC-hosted event included group member presentations and talks by invited speakers. The workshop was well attended and included representation from partners NASA and NOAA. The event concluded with discussions on how to better foster communications and collaborative efforts among participating members and partners. The ACPRAG is chaired by ESSIC / AOSC Professor Zhanqing Li.