Dr. Lehmann is Associate Professor of Medicine and of Global Health and Social Medicine at Harvard Medical School and the Executive Director of the National Center for Ethics in Health Care. She joined the faculty of the Division of General Internal Medicine in 1999 after completing her fellowship training in general internal medicine at Massachusetts General Hospital. She is a graduate of Cornell University and the Johns Hopkins University School of Medicine. She completed her residency training in internal medicine at Johns Hopkins Hospital and received a Ph.D. in Philosophy from Johns Hopkins University. Her M.Sc. in Clinical Epidemiology is from the Harvard School of Public Health in 1999.

Dr. Lehmann's research is focused on empirical and philosophical analysis of contemporary ethical issues in medicine. She is interested in the moral determinants of medical decision-making and has focused on ethical issues in genetics, truth telling in medicine, religion and medicine, and research ethics. In addition to practicing internal medicine she is an active member of the Brigham and Women's Hospital Ethics Consultation Service, Ethics Committee, and the Partners Institutional Review Board.

The Center for Bioethics at Brigham and Women's Hospital, which Dr. Lehmann directed, supported clinicians and researchers confronting ethical issues in clinical medicine and research, and provided an ethics consultation service for ethical questions that arise in clinical care. The Center also fostered interdisciplinary research in bioethics and encouraged moral reflection on ethical issues in research.

Professor Lehmann was a Faculty Fellow in Ethics in 1997-1998, and became a Faculty Associate of the Ethics Center in 2000.