Massachusetts General Hospital has hired the first woman to lead its huge Department of Medicine. Dr. Katrina Armstrong, a professor of medicine and obstetrics and gynecology at the University of Pennsylvania, will become physician-in-chief of the medicine department on April 15.

Armstrong is a world-renowned investigator in the areas of medical decision-making, quality of care, and cancer prevention and outcomes. She led the Penn Center for Innovation in Personalized Breast Cancer Screening program, funded by the National Cancer Institute and dedicated to studying emerging methods of breast cancer detection. She is a graduate of Yale University and Johns Hopkins University School of Medicine,

She replaces Dr. Dennis Ausiello.

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Women also head the departments of neurology, anesthesia, and ophthalmology at Mass. General.