Erik L. Kollberg: 1937-2023. Erik passed away on October 14, 2023.

Erik Kollberg was an outstanding engineer, scientist, and internationally recognized expert in millimeter-wave and sub millimeter-wave radio technology. He was a pioneer in the development of high frequency (THz) radio astronomy instrumentation, including devices, components, systems, and telescopes. He was a friend and colleague to hundreds of scientists and engineers around the globe and his passing will be strongly felt by the many individuals he worked with and befriended over the years. Most of his career was spent at Chalmers University in Sweden where he worked as a beloved teacher and distinguished professor for more than 50 years. A very detailed and complete biographical compendium of Professor Kollberg’s work and pioneering contributions to the THz community can be found in: P. H. Siegel, “Terahertz Pioneer: Erik L. Kollberg “Instrument Maker to the Stars”,” in IEEE Transactions on Terahertz Science and Technology, vol. 4, no. 5, pp. 538-544, Sept. 2014, doi: 10.1109/TTHZ.2014.2344191. https://doi.org/10.1109/TTHZ.2014.2344191