I have been a graduate student at M.I.T, a postdoc in Saclay, and a CERN fellow. I have been a staff physicist with INFN from 1990 to 2002, in Torino and Rome. Since January 2003 I am full professor of theoretical physics at the University of Milan. I have been a visiting professor in Barcelona, a visiting fellow in Edinburgh and at Ecole Polytechnique, and a visiting lecturer at Ecole Normale Superieure de Lyon. I have played some role in past particle physics facilities as a member of the SPS committee at CERN from 2001-2004 and as a convenor of the HERA-LHC workshop from 2004 to 2008; on present experiments as a member of the steering group of the PDF4LHC workshop; and on possible future facilities as a member of the steering committee of the LHeC . My collaborators include Guido Altarelli in Rome and CERN, Richard Ball in Edinburgh, José Ignacio Latorre in Barcelona, and Giovanni Ridolfi in Genova.