Elisabeth L. Rosenthal, is a trained medical doctor, who is working on a year-long series on health care costs. From 2004 to 2013, she was the international environment correspondent for The New York Times and the International Herald Tribune.Previously, Ms. Rosenthal had been a correspondent in the Beijing bureau since the fall of 1997.During her tenure in Beijing, she broke a number of landmark stories on health in China, including the spread of HIV, the demise of the rural health care system and efforts to market patented U.S. drugs in China.Before that she was a metropolitan reporter covering health and hospitals.She was a regular contributor at Science Times for three years before joining The Times in July 1993.