I missed this news earlier, but legendary early OS and computer architecture researcher Jack Dennis died in March. He was at MIT from 1949 -- before their first computer! -- until retirement and beyond, and did pioneering work on hardware support for time-sharing on the PDP-1 and on the memory and protection architecture of Multics. Some of the many things he introduced include: * segmented virtual memory * capability-based security * dataflow computation and architectures * starting the SOSP conference * probably being the first person to name a variable 'foo' (!) https://news.mit.edu/2026/jack-dennis-pioneering-developer-dataflow-models-of-computation-dies-0410