Dave uses in-situ spacecraft observations to study the dynamics of the Earth’s magnetosphere.  He uses plasma wave observations from the EMFISIS instrument on NASA’s Van Allen Probes satellite mission, as well as MMS measurements, to study very low frequency (VLF) waves which play a critical role in driving variations in the different particle populations contained within the inner magnetosphere.  Dave is currently Principal Investigator of two NASA grants, and Co-Investigator on an NSF-GEM grant.