Dr. Nissenson is Emeritus Professor of Medicine at the David Geffen School of Medicine at UCLA where he also served as both associate dean and the director of the dialysis program. He was Chief Medical Officer for DaVita Kidney Care for over 11 years and now serves as an emeritus chief medical officer. He is the past chair of Kidney Care Partners and past co-chair of the Kidney Care Quality Alliance. He serves on the Government Affairs Committee for the Renal Physicians Association where he formerly served as president. As a founder of RMS Disease Management Inc. and RMS Lifeline Inc., Dr. Nissenson actively worked on the development of new models of integrated care management for the chronically ill. Dr. Nissenson has authored over 700 publications in the field of nephrology, dialysis, anemia management, and health care delivery and policy, along with serving as the editor of two dialysis textbooks. He has previously served as president of the Southern California End-Stage Renal Disease Network, chair of the Medical Review Board, and as a Robert Wood Johnson Health Policy Fellow of the Institute of Medicine.