Our colleague and friend, Dr. Don Arendt, passed away from pancreatic cancer on October 14. Though he underwent treatment for three years, his passion for his work gave him purpose and endurance. Dr. Don, as he was affectionately known, served for 20 years in the US Army as a warrant officer and followed that with a 24-year career at the Federal Aviation Administration (FAA), where he changed the course of aviation safety both at home and around the world. His name has come to be synonymous with safety management systems (SMS), safety culture, and organizational/human performance around the world. He was a civil servant, academic, author, and world-renowned speaker on SMS.