Daniel Wikler is Mary B. Saltonstall Professor of Ethics and Population Health at the Harvard School of Public Health. He served as the first “Staff Ethicist” for the World Health Organization, where he has subsequently been a consultant to several programs, including its consultative group on ethical dimensions of universal health coverage. In recent years, he has been concerned primarily with bioethical issues arising at the population and global levels. Among his recent works, published with colleagues in the US and abroad, are the World Health Organization’s Casebook in Ethical Issues in International Health Research; Inequalities in Health: Concepts, Measures, Ethics; and Measuring the Global Burden of Disease: Philosophical Dimensions, published by Oxford University Press in a series co-edited by Prof. Wikler and Prof. Nir Eyal under the title Population-Level Bioethics.