Leonardo Gariboldi is a research fellow in the History of Physics and Physics Education at the University of Milan. His research interests concern the history of nineteenth and twentieth-century physics, particularly with regard to Aldo Pontremoli, Beppo Occhialini, and the CISE nuclear research center. He published with Springer “The Milan Institute of Physics: A Research Institute from Fascism to the Reconstruction”.Massimo Gervasi is Associate Professor at University of Milano Bicocca, teaching Cosmic Ray Physics for the Master degree in Astrophysics; INFN and CERN associate; Degree in Physics and PhD in Astronomy at University La Sapienza, Rome; Research activity in Cosmic Microwave Background observations from ground and space, in Cosmic Rays observation from space (AMS on ISS), in Radiation environment and damage in Space.Giorgio Sironi retired full professor of radioastronomy, 60 years of research on cosmic ray electrons, gamma radio astronomy, galactic radio emission, 3K background, equipment for space studies.Aldo Treves graduated in Physics with Giuseppe Occhialini in 1968. Scientific and academic actiivity at University of Milan, Massachusetts Institute of Technology, SISSA, Trieste, University of Insubria, Como. Main subjects of research: Astrophysics of Collapsed Objects, theoretical aspects and observations with space and ground based instrumentation.Pasquale Tucci has been Professor of History of Physics at the Università degli Studi di Milano. He was the coeditor, together with Pietro Redondi, Giorgio Sironi, Guido Vegni, of the book The Scientific Legacy of Beppo Occhialini (Bologna: Springer-Verlag Berlin Heidelberg, 2006). His last paper, written with Leonardo Gariboldi, is “Occhialini’s Memoirs” Giornale di Fisica (Supplemento) 2022 63: 1-73.