Dr. Navarra (Naples, 1956) graduated in Physics in Bologna in 1980 and returned to Italy in 1986, after getting a Ph.D. at the Geophysical Fluid Dynamics Laboratory at Princeton University. He is Dirigente di Ricerca at the National Institute of Geophysics and Volcanology, where he carries out his activity in the field of the climate simulation with general circulation numerical models. He is now President of the CMCC _ Centro Euro-Mediterraneo per i Cambiamenti Climatici. The scientific interests of Dr. Navarra focus on the investigation of the dynamical mechanisms which control climate on the global scale, particularly regarding the natural climate variability of the atmosphere-ocean system on interannual, decadal and centennial scales. The general aim is to understand and document the main modes of climate variability on interannual and decadal scales (teleconnections) by means of statistical methods, numerical simulations and simplified models. These studies are the natural complement of the second activity field, which concerns the simulation and the evaluation of the climate changes using scenarios of the future climate. Dr. Navarra is also teaches at the Universita di Bologna, sede di Ravenna, Corso di Laurea in Scienze Ambientali. He is the author of several books and articles of general interest and contributes to national newspapers. He has written: El Nino. Realta e leggende del fenomeno climatico del secolo (Avverbi, 1997), Le previsioni del tempo (Il Saggiatore, 1996) and, with Andrea Pinchera, Il Clima, (Laterza, 2000).