This international school will offer an overview of the observational constraints, the interpretative tools and the theoretical frameworks used for studying the interstellar medium in galaxies from the epoch of reionization to contemporary Universe. Furthermore, it aims to build a synergy between the Galactic and extragalactic ISM communities. Time will be devoted to discussion between participants and lecturers, with the hope of kick-starting original projects.

The current and future generations of instruments allow us to observe galaxies with spatial resolutions and sensitivities that could be achieved only in the Milky Way a mere decade ago. In addition, extragalactic environments, through the diversity of their physical conditions (metallicity, star formation activity, presence of an AGN, etc.), provide laboratories to benchmark gas and dust models across a wider range of parameters than can be accessed in the Milky Way. Finally, progress in data analysis (machine-learning and big data approaches) are progressively revolutionizing science. This school aims to prepare the next generation of astronomers for future paradigm shifts in our understanding of interstellar matter through cosmic time.

The school will be held virtually via the Zoom platform. It will consist of both formal lectures and hands-on projects.

• François BOULANGER (ENS, Paris, France)
• Émeric BRON (LERMA, Paris, France)
• Véronique BUAT (LAM, Marseille, France)
• Sylvie CABRIT (LERMA, Paris, France)
• Benoît COMMERÇON (CRAL, Lyon, France)
• Karine DEMYK (IRAP, Toulouse, France)
• David ELBAZ (CEA, Saclay, France)
• Gary FERLAND (University of Kentucky, USA)
• Andrea FERRARA (SNS, Pisa, Italy)
• Adam LEROY (Ohio State University, USA)
• Frédérique MOTTE (IPAG, Grenoble, France)
• Eve OSTRIKER (Princeton University, USA)
• Florent RENAUD (Lund Observatory, Sweden)
• Raffaella SCHNEIDER (University of Rome, Italy)

• Jean-Philippe BERNARD (IRAP, Toulouse, France)
• Matthieu BÉTHERMIN (LAM, Marseille, France)
• Longji BING (LAM, Marseille, France)
• Andrea BRACCO (Ruđer Bošković institute, Zagreb, Croatia)
• Émeric BRON (LERMA, Meudon, France)
• Véronique BUAT (LAM, Marseille, France)
• Sylvie CABRIT (LERMA, Paris, France)
• Benoît COMMERÇON (CRAL, Lyon, France)
• Karine DEMYK (IRAP, Toulouse, France)
• Gary FERLAND (University of Kentucky, USA)
• Frédéric GALLIANO (AIM, CEA-Saclay, France)
• Gayathri GURURAJAN (LAM, Marseille, France)
• Annie HUGHES (IRAP, Toulouse, France)
• Vibor JELIC (Ruđer Bošković institute, Zagreb, Croatia)
• Eric KOCH (Center for Astrophysics, Harvard, USA)
• LE Ngoc Tram (Bonn, Germany)
• Adam LEROY (Ohio State University, USA)
• Frédérique MOTTE (IPAG, Grenbole, France)
• Angelos NERSESIAN (Ghent University, Belgium)
• Jérôme PETY (IRAM, Grenoble, France)
• Jean-François ROBITAILLE (IPAG, Grenoble, France)
• Erik ROSOLOWSKY (University of Alberta, Canada)
• Jiayi SUN (Ohio State University, USA)
• Patrice THEULÉ (LAM, Marseille, France)
• Nathalie YSARD (IAS, Orsay, France)

Programme National de Physique et Chimie du Milieu Interstellaire (PCMI) of CNRS/INSU (https://www.pcmi.cnrs.fr/).

Programme National de Cosmologie et Galaxies of CNRS/INSU (https://pncg.lam.fr/).