just adding a bit more on her background.
http://www.nlm.nih.gov/changingthefaceofmedicine/physicians/biography_335.html "After several years of working in the movement against the Vietnam War, I sought a career that would allow me to continue my work for social change. I also loved math and science. Medicine was a career that allowed me to combine both my interests.
Dr. Stephanie J. Woolhandler advocates guaranteed access to health care for all members of society, including the forty-two million Americans currently without medical insurance. In 1986 she helped found Physicians for a National Health Program, a not-for-profit organization for physicians, medical students, and other health care professionals who advocate a national health insurance program.
On the Harvard faculty since 1987, Dr. Woolhandler has conducted research and published her results in dozens of articles, chapters, and books, including Bleeding the Patient:The Consequences of Corporate Health Care, published in 2000. Studying the inequalities in health and health care, administrative costs in medicine, and national health insurance, she promotes a national health program with a single payer system. Towards that end, she helped found Physicians for a National Health Program (PNHP) in 1986, a not-for-profit organization of physicians, medical students, and other health care professionals who support a national health insurance program. Since that time, PNHP has flourished and now numbers about ten thousand physicians who support national non-profit health insurance..."