Reminiscences of Professor Wilhelm Simon and his research work at the ETH Zürich

The Symposium on Electrochemical Sensors was dedicated to the memory of the late Professor Wilhelm Simon. We all remember him as a remarkable and renowned scientist, and as an enthusiastic and inspiring lecturer. In particular, he was a pioneer in research on ion‐selective electrodes. With this article, the authors would like to pay due reverence to him and to his outstanding contributions to analytical chemistry.