Those of us who think in terms of legacies hope that, when our time comes to cease being a behavior analyst (when they pry that tattered copy of Science and Human Behavior from our cold, dead hands 1 ), we will be remembered for doing something well. The difficulty in memorializing our friend and colleague Ronnie Detrich (Figure 1), who passed away peacefully on September 9, 2023, is that he was, in whatever he chose to work on, among the best we ever met.Ronnie worked on a lot of things over a career that spanned more than 5 decades. His early professional years were spent delivering services to people with disabilities in places where few wanted to tread: the back ward of a state hospital, a desperately underfunded Native American reservation, and schools that needed but didn't want his expertise. Between then and 2023, he also conducted translational research in a pigeon laboratory, conducted applied research on correspondence training, helped to build a model service delivery agency (Spectrum Center), and cofounded a nonprofit organization devoted to promoting evidence-based education (the Wing Institute 2 ). He read and discussed philosophy, developed rigorous but supportive staff supervision systems, and organized multidisciplinary events that brought together behavior analysts and others who care deeply about the education system and the people it serves.The thing about Ronnie was that if you weren't paying close attention, you could easily miss him. He was the furthest thing possible from a self-promoter, and if he had something to promote-for instance, mission-driven Wing Institute "think tank" gatherings-the topic was front and center. First and foremost, he was a listener. When he did speak up, his message was forceful and incisive, yet designed to advance the conversation, not to advance his standing. No one we've known more comfortably embodied Skinner's (1972) perspective on personal credit and responsibility, as laid out in "A lecture on 'having a poem'" and elsewhere.During the second half of his career, Ronnie took aim at two things he found intolerable: that the public education system should be mediocre and that behavior