The Most Rev. Justin Welby is the archbishop of Canterbury, head of the Church of England. He has engaged a number of social issues since being installed in this role in March 2013, including poverty, climate change and medically assisted suicide.

Jorge Merchan Price is the author of Medical Ethics: Abuses and Controversies. He leads the Medicos Azules movement, which opposed the legalization of physician-assisted suicide in Colombia.

Mark Pickering is the chief executive officer of the Christian Medical Fellowship, which serves Christians in the field of medicine in the United Kingdom.

Philip Nitschke is the founder of Exit International, which asserts that choosing the time and manner of one’s death is a human right. He supported and took part in medically assisted suicide in Australia before losing his medical registration as a result of his advocacy work.

David Clark is a professor of medical sociology at the University of Glasgow, where he leads the Glasgow End of Life Studies Group. He is also a vice president for Hospice UK and assisted the Scottish government as it drafted its framework for palliative and end of life care.

Liat Ayalon is deputy director of the school of social work at Bar-Ilan University in Israel, where she specializes in aging. She is also a member of the Bioethics Advisory Committee of the Israel Academy of Sciences and Humanities.

Madison Shockley is the pastor of Pilgrim United Church of Christ in Carlsbad, Calif. He serves on Compassion and Choices’ Strategic Impact Committee, advocating for access to a full range of end-of-life care options.

Peg Sandeen is executive director of Death with Dignity, an organization that works to increase access to medically assisted suicide. She was previously executive director of the AIDS Project of Central Iowa.

Dr. Imran Qureshi is board president for the Islamic Medical Association of North America. He is a radiologist.