He received a Ph. D. in mathematics from the University of Messina in 2003. His research interests are devoted to the study of the existence and multiplicity of solutions for nonlinear boundary value problems involving elliptic equations, difference equations, differential inclusions and variational-hemivariational inequalities. In particular, his research focuses on variational techniques, combined with topological arguments and sub-super-solution methods, in both the smooth and non-smooth framework.