Philip G Ratcliffe has been a research assistant at Cambridge and London Universities and with the INFN Milan and Turin sections. In 1996 he moved to the School of Sciences in Como, at the University of Insubria, to take up a permanent position as a University Researcher in Theoretical Physics. His research activities regard elementary particle physics theory and phenomenology and he has spent periods visiting such institutions and laboratories as CERN, MIT, SLAC, Fermilab, BNL, INT (Seattle), the CPT in Marseille and the University of Paris.