String field theory is the quantum field theory that describes the dynamics of interacting strings. The principal advantages of string field theory are that it allows the computation of off-shell amplitudes and, gives non-perturbative information that cannot be seen directly from the standard genus expansion of string scattering. Unfortunately, the biggest problem of closed string field theory is that simple tools for performing calculations are not readily available. The main goal of my current research is to develop a calculable formulation of closed string field theory by exploring the collection of breakthrough works on the Weil-Petersson symplectic geometry of the moduli space of Riemann surfaces in recent years.