This session calls for observational, theoretical, or spaceflight missions that studies radiation belt wave-particle interactions and the dynamical acceleration and loss processes of particles in the radiation belts and inner magnetosphere. Especially encouraged is work from the Van Allen Probes, MMS, ARASE, THEMIS, and Cluster missions, as well as science motivation for new mission concepts resulting from Heliophysics 2050 and Decadal Survey planning. The dynamics of the radiation belts are not comprehensively understood yet despite its discovery 60 years ago. It is of great scientific and practical interest to predict the dynamics of the radiation belts to help improve space weather predictions, assisting the mitigation of hazardous space weather effects on spacecraft operations. Generally, it is understood that the radiation belt dynamics arise from a delicate balance between acceleration, transport, and loss processes. Radiation belt models require accurate knowledge of wave-particle interactions in the radiation belts and inner magnetosphere.