Steward Health Care System's Ralph de la Torre is building a model for the future. Geoff Colvin, Fortune, August 2, 2012 What's the future of American health care? Dr. Ralph de la Torre, CEO of Steward Health Care System, may represent the answer. Steward, owned by the private equity firm Cerberus Capital Management, is a growing Massachusetts-based group of community hospitals, and industry analysts say de la Torre is one of the most dynamic and influential executives in the business. He's consolidating hospitals, finding efficiencies, investing big in infotech, and creating a new model that he says won't change much regardless of how Obamacare's future plays out. ... Health