Mark Kuczewski is an American philosopher and bioethicist. He has been a key contributor to the New Professionalism movement in medicine and medical education. In general, interest in professionalism has been widespread in medicine probably owing to the increasing regulatory and economic pressures on the practice of medicine. Many physicians have sought to identify the focal meaning of what it is to be a doctor in an effort to revitalize the profession. Kuczewski has been among a group that includes Richard and Sylvia Creuss, John Coulehan, and Matthew Wynia who see medical professionalism as including a commitment to social justice. That is, while professionalism entails such things as etiquette, communication skills, and basic medical ethics, professions are also expected to be leaders in educating the public and in advocating for the health of the public. Such leadership requires an understanding of the factors that lead some patient populations to be underserved and a commitment to bringing about social change to ameliorate these problems.