Condensed phase charge transfer mechanisms control prominent reactions in all branches of chemistry, physics, and biology. The prevalence of such reactions provides great motivation to further develop the methods by which they are studied computationally. The work that follows introduces a powerful new approach for computer simulation of charge transfer processes in condensed phase that has the potential to transform our fundamental understanding of these reactions, broadly complementing the work of scientists in diverse disciplines. Condensed phase reactions evolve over a rough potential energy surface, often depending on rare environmental fluctuations to drive the reaction from reactant to product. The expansion of reaction rate theory has given rise to various computational methods able to address the difficult task of sampling an ensemble of rare reactive events. Transition path sampling (TPS) is one such formalism. TPS is a powerful statistical framework that provides mechanisms of complex reactions without the need to define reaction coordinates or identify transition states a priori. TPS thereby enables us to study a great variety of problems for which this would be daunting task. Condensed phase charge transfer reactions present an additional challenge as these complex reactions are governed by explicit quantum mechanical phenomena. To accurately describe such reactions, one must consider the additional electronic and vibrational energy states to which the ground potential energy surface is coupled. High computational cost, however, limits their investigation. Mixed quantum-classical methods alleviate some of this cost by separating the degrees of freedom containing intrinsic quantum mechanical character from those that can be treated classically. Among many algorithms, surface hopping methods provide trajectories access to these excited states via nonadiabatic transitions. Nonadiabatic path sampling (NAPS), seeks to generalize the TPS formalism to accommodate reactions involving multiple electronic and vibrational energy states. NAPS will enhance our understanding of charge transfer reactions in the condensed phase by modeling reaction timescales currently beyond the scope of molecular simulation, and identifying specific molecular motions that influence or control the mechanisms and kinetics of charge transfer reactions.