Joseph University of Beirut in 1999. He then obtained a Certificate in Advanced Education in General Dentistry from Boston University, Goldman School of Dental Medicine in 2000. He pursued a Masters in Endodontics, Masters in Biomaterials and obtained his PhD in 2020 from the Saint Joseph University, Lebanon with honors. He is currently a Clinical Professor at the Department of Endodontology at the Saint Joseph University Dental School, Lebanon where he supervises undergraduate and postgraduate students. He is also lecturer at the Masters program in endodontics at the Siena University Italy. Pr Kaloustian is the president of the Lebanese Society of Endodotology and co-organizer of many international endodontic meetings. He is also a Diamond member of Style Italiano Endodontics, an international lecturer with many publications in ndexed journals. Pr Kaloustian has a private practice in Beirut limited to Endodontics and works asendodontist in the United Arab Emirates at the American Dental Center (Abu Dhabi) and Oris Dental Clinic (Al Ain) .