In the same university he got a Ph.D, working in the group of Alessandro Bottino, and in 1995 he presented his dissertation: “Dark matter: neutralino relic abundance and its detection signals”.

He worked as a postdoc at the Johns Hopkins University (USA), at the University of Valencia (Spain) and as a visiting scientist at the Korea Institute for Advanced Study (South Corea), Laboratoire de Physique Theoretique (France), Galileo Galilei Institute for Theoretical Physics (Italy) and CERN (Switzerland).

He is currently a member of the scientific commission of the Gran Sasso National Laboratories, co-chair of the scientific commission of the International School on Astroparticle Physics (ISAAP) and chair of the governing board of the International conference on Topics in Astroparticle and Underground Physics (TAUP).

Among the leading experts of neutralinos and light sneutrinos in supersymmetry, together with his collaborators, he proposed two new techniques to reveal dark matter: the research of antideuterium via space telescopes and the angular cross-correlation of extragalactic gravitational signals and dark matter non gravitational signals.

He has more than 100 publications on international scientific magazines and an Hirsch index major than 50.