The oscillation of neutrinos between flavor states is the first clear evidence of physics beyond the Standard Model. Since the first observation of oscillations in 1998, most of the parameters describing the mixing have been measured, but often not with high precision, and some key questions remain unanswered: Do neutrino oscillations violate CP-symmetry? What is the ordering of the neutrino mass states? In this seminar I will discuss recent measurements from the NOvA experiment probing these open questions, as well as the prospects for DUNE to definitively answer them and make precision measurements of the neutrino oscillation parameters.