David M. Zientek is Clinical Assistant Professor at the Department of Internal Medicine, University of Texas at Austin Dell Medical School, USA. He has practiced general and interventional cardiology for 29 years and served as co-chair of the Ascension Seton Medical Center ethics committee for 17 years and a member of the American College of Cardiology Ethics and Disciplinary committee for 6 years.

Mark J. Cherry is the Dr. Patricia A. Hayes Professor in Applied Ethics and Professor of Philosophy, St. Edwards University, USA. He is Editor of The Journal of Medicine and Philosophy, Senior Editor of Christian Bioethics, and Editor-in-Chief of HealthCare Ethics Committee (HEC) Forum. He is the author of Kidney for Sale by Owner: Human Organs, Transplantation, and the Market (2005/2015) and Sex, Family and the Culture Wars (2016).