Dr. Antoun is the CEO and Chairman of the Board of L-Nutra, a unique Nutri-tech company leading the Food as Medicine movement by applying cutting edge Science to Nutrition research first to uncover what humans should eat to live healthier longer and second to help patients achieve better health outcomes. Dr. Antoun served as the Chairman of the Board at the Global Healthspan Policy Institute (GHPI) and as a member of Forbes Business Development Council.

Before taking on these roles, Dr. Antoun was the CEO of Health Systems Reform, a boutique consultancy aimed at elevating public health through reforming health systems, strengthening healthcare management and improving healthcare delivery; the Co-Director of the Center for Health Policy at the University of Chicago; an adjunct Professor of Health Policy at the Buck Institute for Research on Aging; and a fellow at the Department of Social Policy at the London School of Economics and Political Science. Dr. Antoun founded and served as the Co-Editor in Chief of the Journal of Health Systems and Reform.