Peter Rosen, MD, FAAEM, one of the main founding fathers and mothers in the field of emergency medicine, passed away in Tucson, Arizona, on the 11th of November 2019 from complications of chronic diseases, with his best friend and wife Ann at his side. He was 84 years old.Dr. Rosen dedicated decades of his life advocating and promoting the field of emergency medicine as a medical discipline and academic specialty, one that stands in parity with all other primary categorical specialties.