The American Society of Emergency Radiology (ASER) was founded in 1988 and is celebrating its 25th Anniversary. ASER is thriving and emergency radiology has never enjoyed greater popularity than at present. This history describes the genesis of the Society, its growth and current state of affairs. It is based on the recollections and personal files of the authors, one Founder and both former ASER Presidents and Gold Medalists, the ASER archives, and interviews and correspondence with many ASER members. It is hoped that this brief review will be interesting to the reader, provide some insight into ASER evolution over the years, and hold some lessons moving forward.