I did not interact much with the late Charles. I used to run into him at conferences and summer events. Occasionally we discussed issues of common interest. I recall vividly, however, the summer of 1995 when we both took part (with a number of other visitors) in the ICASE summer program (at NASA Langley). The place was very crowded and small offices were packed by three or even four visitors (program participants). Without any doubt, Charles was the most papular guy around, not only because of his well-known publications on the matter, but also because of his reputation of a broad erudition, excellent theoretical background, and readiness to discuss any topic. Many people wanted to talk to him. However, in most cases a simple question would lead to a long monologue by Charles. With office doors kept open, we could all hear him and listen to his “lectures” in another office. And he was tireless. But no one seemed disturbed. On the contrary, most people opened their ears widely trying to figure out what he was talking about. The last time I saw him was on the occasion of the ICASE/NASA LARC/AFOSR Symposium on modeling complex flows in August 1997. It was held in a big hotel (I do not recall the location; the proceedings, edited by M. D. Salas, J. N. Hefner, and L. Sakell, were published by Kluwer Academic Publishers in 1999). Charles came only for a day to deliver his lecture. I talked to him briefly and he told me that he had been in an accident (he slipped and fell over on ice), broke his arm, and suffered from various complications. Apparently it took him a long time to partially recover. He looked weak, but was still optimistic. Shortly afterwards, I learned that his recovery was rather slow and not very successful.