Prof. Ounsi graduated from the school of dental surgery, University of Montpellier, France. He holds a master in endodontics, a master in medical and biological sciences, a research master in oral biology from Saint-Joseph University in Beirut, and a PhD in Dental materials from the University of Siena. Prof. Ounsi has also obtained his HDR from the university of Besançon and is presently an assistant professor at the Lebanese University and an adjunct professor at the department of medical biotechnologies of Siena University.

He serves on the editorial boards and scientific advisory boards of journals such as the Journal of Endodontics and the Saudi Endodontic Journal, and reviews for International Endodontic Journal, Dental Traumatology, and the Journal of the American Dental Association. He is a fellow of the International College of Dentists, and a member of the European Society of Endodontology and the American Association of Endodontists. He authored and co-authored more than 50 publications, and presented and conducted more than 200 lectures and courses in 4 continents.