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It was with great sadness that I heard that Ken has passed away. I had many encounters with him over the course of more than 40 years, and the thought that his presence, his voice, his driest of all wits are now all gone is difficult for me to believe.
I met Ken in 1972 in Ithaca, New York when he was a student in Applied Physics with Benjamin Siegel at Cornell University, and I was a postdoc there finishing the third of three parts of my Harkness Fellowship. Ken at that time was deeply immersed in single-sideband holography, which he hoped to implement on Siegel’s experimental 600-kV electron microscope. Alas, that microscope never got really productive, and the holography remained a theoretical exercise. However, the discussions we both had on electron optics, wave aberrations and instrument corrections were quite inspiring, and this is where my admiration for his intellect, wit and compassion for science started, never to leave me.