Roy J. Glauber, Mallinckrodt Professor of Physics at Harvard University, Cambridge, MA, USA, and winner of the Nobel Prize in Physics in 2005 “for his contribution to the quantum theory of optical coherence", will visit Trieste from Tuesday 23 to Friday 26 May. On Wednesday 24 May, Glauber will present a public lecture, “One Hundred Years of Light Quanta", at 15.30 at the University of Trieste, Building H3 Lecture Room. On Friday 26 May, he will give a technical lecture, “Quantum Optics and Heavy Ion Physics", at the closing session of the Conference on Perspectives in Hadronic Physics, in the ICTP Main Lecture Hall at 15.30.