It is with great sadness that we report Prof. Helmut Wiedemann’s passing on September 23, 2020 in Thailand. Helmut was a remarkably productive scientist and professor at Stanford University and served as our Director from 2002-2006. But he was much more than that, he was a dear friend for more than 30 years who left a wonderful legacy of positive impact on our students and the community. Helmut designed and built the hands-on measurement labs in our Fundamentals course. Many fondly remember the popcorn and cookie tins he adapted to demonstrate aspects of RF cavities. Helmut was a gifted lecturer and inspired many while teaching at our symposium-style schools, our university-style schools and our international schools. His textbooks, including the now 4th edition Particle Accelerator Physics are among our most-often used and have had high impact in our field. Helmut’s legacy lives on in every student who attends the USPAS. We will miss him.