Stefano BONASSI (65), Professor of Hygiene and Preventive Medicine at the San Raffaele university in Rome, is interested in the use of biomarkers in human population and clinical studies. He coordinated the epidemiological part of large international projects, such as the ESCH on chromosome aberration, the HUMN and HUMNxl on the micronucleus assay, and ComNet on DNA damage. His current interest includes neurodegenerative disorders, COPD, ageing and frailty, pharmacoepidemiology, respiratory rehabilitation.