Full Professor in Astronomy and Astrophysics at the Department of Physics of Università di Napoli "Federico II" and President of Italian Society for General Relativity and Gravitation (SIGRAV). He spent several periods of his scientific career in USA, Germany, Poland, UK, Mexico, South Africa, Canada and France. His scientific activity is essentially devoted to research topics in General Relativity, Cosmology, Relativistic Astrophysics and Physics of Gravitation in their theoretical and phenomenological aspects. In particular, his research interests are: Extended Theories of Gravity and their cosmological and astrophysical applications; Large Scale Structure of the Universe; Gravitational Lensing; Gravitational Waves; Galactic Dynamics; Quantum Phenomena in gravitational field; Quantum Cosmology.