Vasilis' research spans a range of topics in gravitational physics, and theoretical/computational astrophysics. His ultimate goal is to understand strong-field gravitation and solve long-standing astrophysical/cosmological puzzles such as the nature of the progenitors of short gamma-ray bursts, the origin of X-shaped radio galaxies, the nature of the equation of state above the nuclear saturation density, the way through which planets may form around isolated pulsars, and tests of fundamental physics including modified gravity. He is interested in studying compact objects as multimessenger sources, i.e., as sources of gravitational wave, electromagnetic and neutrino signals. For this reason, compact object binaries, such as black hole-black hole (BHBH), neutron star-neutron star (NSNS), black hole-neutron star (BHNS), and white dwarf-neutron star (WDNS) systems are a major theme of his research. He develops and uses both (semi)-analytic methods and state-of-the-art codes at supercomputer centers, to study the equations of relativistic gravitation and simulate systems of interest.