RecruitingPhase 1Drug trialCD79b-19 CAR T Cells in Non-Hodgkin LymphomaThis research study involves the study of CD79b-19 CAR T cells for treating people with relapsed/refractory Non-Hodgkin Lymphoma and to understand the side effects when treated with CD79b-19 CAR T cells. This research study involves the study drugs: * CD79b-19 CAR T cells * Fludarabine and Cyclophosphamide: Standardly used chemotherapy drugs as part of lymphodepleting process