Dr Stefano Decesari is a senior researcher at the Institute of Atmospheric Sciences and Climate (ISAC) of the National Research Council of Italy. He has been working in the field of physical and chemical processes occurring in multiphase atmospheric systems (aerosols and clouds) for almost 20 years. He has developed original chemical methodologies for source attribution of complex organic atmospheric particulate matter in airborne particles. He is author or coauthor of more than 100 peer-reviewed publications. He took part to more than ten EU research projects dealing with atmospheric particulate matter formation and impact on climate and air quality, and he coordinated three international experimental field campaigns. He is a specialist in atmospheric organic aerosol chemistry with experience on biomass burning aerosols and biogenic organic aerosols formation in hotspot areas: in the Mediterranean, tropical forests, high mountain areas and cold climates.