From October 2017 to October 2019 he was a member of the team of the XMCD BOREAS beamline, ALBA-CELLS synchrotron in Barcelona. Dr. Agrestini has a deep knowledge of full atomic multiplet and ligand field theory and, together with Prof. Frank De Groot, Utrecht University, organized a 3 days school (4-6 June 2018) of crystal field and ligand field calculations of XAS, XMCD, RIXS e XPS spectra at the ALBA Synchrotron. Presently, in Diamond he uses his theoretical expertise to simulate and interpret d-d and charge transfer excitations in RIXS spectra. His scientific focus is on the study of the interplay between lattice, magnetic and electronic properties in highly correlated systems, exhibiting phenomena such as Metal-Insulator transition, Colossal Magneto-Resistance, and high Tc superconductivity, and on the role played by crystal field and spin-orbit coupling in determining the ground state symmetry of 4d and 5d transition metal compounds.