In Appreciation: Don L. Boyer (1938-2020)

Don Lamar Boyer, a pioneer of physical modeling of rotating and stratified topographic flows, passed away in Las Vegas, Nevada on June 19, 2020. A visionary in and champion for geophysical and environmental fluid dynamics research, a dedicated mentor and a skilled administrator, he played an influential leadership role in the evolution of laboratory-based research in environmental flows as well as the growth of this journal itselfby providing learned advice to the editors and, on occasion, acting as a (virtual) Guest Editor.