4D N=2 theories exhibit a rich structure of RG flows between UV and IR SCFTs. With G. Elliot, M.J. Kang and C. Lawrie, we have been this structure of RG flows from a variety of perspectives. In this talk, I would like to focus on the Vertex Operator Algebra (VOA) that can be associated to a 4D N=2 SCFT, and what these VOAs can tell us about the Higgs Branch RG flow between these theories.