PHILADELPHIA -- Elliott Fisher, MD, MPH, the health policy researcher who originally coined the term "Accountable Care Organization," is interviewed during a visit to the University of Pennsylvania immediately after he was named Director of the Dartmouth Institute for Health Policy & Clinical Practice. The Institute, which oversees operation of the famed "Dartmouth Atlas," is one of the most influential academic organizations in the field of healthcare policy research. Interviewed by Robert Wood Johnson Foundation Clinical Scholar Chileshe Nkonde-Price, MD, Fisher discusses the formative days of the ACO idea and the many challenges the concept faces as proponents work to evolve it into a central structure of the Affordable Care Act's broad reforms.