Marion Danis is a physician and bioethicist. She served as Head of the Section on Ethics and Health Policy in the Department of Bioethics at the Clinical Center of the National Institutes of Health and Chief of the Ethics Consultation Service at the Clinical Center from 1997 until 2023. She has chaired the International Society on Priorities in Health Care and has been a board member of the Hastings Center. She has studied patients’ treatment preferences at the end of life and the effectiveness of advance directives in promoting their preferences. She has studied strategies for fair rationing of limited health care resources by involvement of the public and on promoting strategies to address the social determinants of health to reduce health disparities. She and Dr. Susan Dorr Goold designed the CHAT exercise, a decision tool for engaging the public in priority setting. She and co-authors have advocated for involvement of bioethicists in addressing racism. She has been the lead editor of several books published by Oxford University Press including Ethical Dimensions of Health Policy, Fair Resource Allocation and Rationing at the Bedside, and Research Ethics Consultation: A Casebook.