The local spin bath that surrounds the nitrogen-vacancy electron system largely determines the attainable electron coherence times. Using nitrogen-vacancy centers as solid state magnetic field sensors requires a through knowledge of the coupling of the center to its magnetic environment. We seek to understand the physical behavior of these centers in a variety of magnetic field regimes and under a variety of perturbations. In this work we address the electron and nuclear spin transitions of spins in the bath surrounding the NV center and observe the response in the optically detected magnetic resonance (ODMR) spectra. The figures above indicate the electron structure of the NV center (left) and a schematic representing the NV center in a bath of spins (right).