My research activities are centred around development of theoretical methods for calculating from first-principles the electronic structure of real materials, in particular those in which electron correlations are strong. These strongly correlated materials are abundant in nature and yet accurate description of their electronic structure is elusive. These materials are characterised by the presence of 3d or 4f elements such as transition metal atoms (3d) or lanthanides (4f), whose orbitals form partially filled bands. Famous examples of these materials are the cuprates high-temperature superconductors, materials possessing colossal magneto resistance, and magnetic materials in general.