We have all been deeply saddened by the death of Stavros Katsanevas last Sunday, 27 November 2022.

Personally, Stavros was an exceptionally nice and positively thinking person, very bright and open-minded, with a very wide spectrum of interests, not only in particle astrophysics, but also in science in general, and beyond, in art, society, philosophy, and even theology. He was a visionary for the field, tirelessly driven by passion for research, until the end.